JP2003060656A - Vlan constructing method in wireless lan, vlan packet processing program for wireless repeater, recording medium recording vlan packet processing program for wireless repeater, wireless repeater with vlan function and wireless vlan system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a wireless terminal belonging to a different sub-network to function under the management of one wireless repeater. SOLUTION: A layer 3 type wireless repeater 4 connected to a LAN trunk line is constituted so as to deliver/receive packets to/from wireless terminals 7a-7g via a cable-connection type wireless repeater 5, wireless connection type wireless repeaters 6A and 6B. Any of these repeaters 4, 5, 6A and 6B remove tags from packets if the packets are tagged in transmitting the received packets to the terminals 7a-7g under their management. In transferring the packets, the repeaters determine whether or not VLAN identifiers must be added, and add the identifiers to the packets if necessary to transfer the packets. Thus, a wireless VLAN can be achieved.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a so-called wireless LA.
The present invention relates to a wireless repeater used in an N (Local Area Network) system and a program used therefor, and more particularly, to a VLAN construction method in a wireless LAN system and a wireless repeater and a wireless VLAN system used to implement the method.

[0002]

2. Description of the Related Art Due to the performance improvement and cost reduction of personal computers, networking of computers becomes easier than ever before, so-called LANs of various scales.
(Local Area Network) is becoming popular. As one form of this LAN, a wireless LAN compliant with IEEE802.11b that enables connection between a terminal and a network via a wireless line
However, it has attracted attention in recent years because it can be connected to a network regardless of the location of the terminal and has the advantage of requiring less wiring work as compared with a so-called wired LAN. A proposal has been made (see, for example, Japanese Patent Laid-Open No. 8-139723). In such a wireless LAN, there is used a wireless repeater generally called an access point, which has a function of mediating the transfer of packets between the network and the terminal while communicating with the terminal via a wireless line.

[0003]

SUMMARY OF THE INVENTION Such a wireless repeater is
In principle, since it is a so-called repeater that amplifies a packet signal and simply relays it, terminals on different subnets cannot belong to the same wireless relay device. That is, in other words, normally, one wireless repeater and a terminal (hereinafter, referred to as a "wireless terminal") under its control belong to the same subnet. Therefore, even if a wireless terminal moves between wireless relays belonging to different subnets, it is not possible to communicate unconditionally, and the wireless relay that will newly belong does not have the IP address of the moving wireless terminal. There is a disadvantage in that setting is necessary and the original advantage of ease of terminal movement in the wireless LAN system is diminished. In addition, changing the subnet to which a wireless terminal moves due to movement of the wireless terminal imposes a situation in which it is necessary to operate according to a policy that differs for each subnet, which leads to a situation in which usability is reduced, and so-called packet filtering becomes difficult and security reliability is reduced. However, there is a problem that it may cause unnecessary traffic generation.

The present invention has been made in view of the above circumstances, and a wireless VLAN construction method and a wireless relay device VLAN packet processing program that allow wireless terminals belonging to different subnets to function as subordinates of one wireless relay device. The present invention provides a recording medium recording a VLAN packet processing program for a wireless relay device, a wireless relay device having a VLAN function, and a wireless VLAN system. Another object of the present invention is to eliminate the need for resetting the IP address even when the wireless terminal moves to a wireless relay station belonging to a different subnet,
Wireless VLAN construction method enabling communication, VLAN packet processing program for wireless repeater, VLA for wireless repeater
Recording medium recording N packet processing program, VLA
It is to provide a wireless repeater and a wireless VLAN system having an N function. Another object of the present invention is to provide a wireless VLAN construction method capable of suppressing generation of unnecessary traffic, a VLAN packet processing program for a wireless relay device, a recording medium recording the VLAN packet processing program for a wireless relay device, and a VLAN function. An object of the present invention is to provide a wireless repeater and a wireless VLAN system having the same.

[0005]

In order to achieve the object of the invention described above, a method for constructing a VLAN in a wireless LAN according to the present invention comprises a wireless terminal via a wireless repeater on a LAN trunk line to which network equipment is wire-connected. Is a method for constructing a wireless VLAN in a wireless LAN system in which packets can be transmitted and received to and from a wired side. In the wireless relay device, a VLAN group is set based on a MAC address for a wireless terminal under the wireless relay device. While storing management information of the wireless terminal, the wireless relay device determines whether the received packet is tagged, and when it is determined that the packet is tagged, the packet is unicast. If the packet is to be sent to the wireless terminal under its control, the packet is deleted by deleting the tag from the packet. When the packet is a broadcast, the packet is transferred, and when the packet is to be transmitted to a wireless terminal under the packet, the tag is deleted from the packet and the packet is transmitted. On the other hand, if it is determined that the received packet is not tagged in the determination as to whether the received packet is tagged, if the untagged packet is unicast, based on the destination MAC address of the packet. Corresponding VLAN identifier is acquired from the management information, added to the packet and transferred, and if the untagged packet is a broadcast, the corresponding VLAN identifier is determined based on the destination IP address of the packet. It is possible to construct a wireless VLAN by acquiring it from a packet and adding it to a packet for transfer. It is made of Te.

In such a configuration, the so-called MAC address-based VLAN is set in the wireless terminal in the wireless relay device, and in the wireless relay device, whether or not the received packet is directed to the wireless terminal under the control. If the packet is for a subordinate wireless terminal, if the packet has a VLAN identifier as a tag, the tag is deleted and transmitted to the subordinate wireless terminal. Determine whether it is necessary to add the identifier as a tag, and if necessary,
The VLAN identifier is added as a tag for transfer, and when the received packet is not from a subordinate wireless terminal stored in advance, various information of the wireless terminal is associated with the MAC address. Since the information is registered as management information, wireless terminals belonging to different subnets can be operated under the control of one wireless repeater, and a wireless VLAN can be easily realized.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS. The members, arrangements, and the like described below do not limit the present invention and can be variously modified within the scope of the gist of the present invention. First, the configuration of the wireless VLAN system according to the embodiment of the present invention will be described with reference to FIG. The so-called hardware configuration of this wireless VLAN system is basically the same as that of a conventional wireless LAN system. First, a LAN trunk line 1 is provided, and the LAN trunk line 1 has various network devices. Is connected by wire. That is, the LAN trunk line 1 includes a server 2, a management computer 3, and a layer 3
The type wireless relay device 4 and further a wired connection type wireless relay device 5 are connected as necessary. Also,
A plurality of wireless connection type wireless repeaters connected to the layer 3 type wireless repeater 4 via a wireless line are provided, and in the embodiment of the present invention, two units, that is, the first and The second wireless connection type wireless repeaters 6A and 6B are provided. Then, the wired connection type wireless repeater 5, the first and second wireless connection type wireless repeaters 6A,
6B and a plurality of wireless terminals 7a to 7g for exchanging packets via a wireless line are provided.

The server 2 is a well-known or well-known one that executes processing in response to a request from a terminal (client), and there are various types such as a file server and a print server depending on its role, but any of them is used here. Of course, it need not be limited to a particular type. The management computer 3 as a management device is a computer for managing the entire wireless LAN system, and may also serve as the server 2 described above. The layer 3 type wireless repeater 4 according to the embodiment of the present invention is a conventional type wireless repeater, that is, in other words, conforms to IEEE802.11 or IEEE802.11b, and
It has a layer 3 switch function, and
It has a so-called tagging VLAN function defined in IEEE802.1Q, and further has a wireless VLAN packet processing function as described later. The wired connection type wireless repeater 5 in the embodiment of the present invention is a conventional type wireless repeater, that is, in other words, IEEEE802.11 or IEEEE802.
In accordance with 11b, a relay device that simply transfers packets transmitted and received between a wireless terminal and a wired LAN is provided with a wireless VLAN packet processing function as described later and an MA as described later.
A C-address-based VLAN setting function is added. In this configuration example, the number of wired connection type wireless repeaters 5 is only one, but, of course, a configuration in which a plurality of wired connection type wireless repeaters 5 are connected may be used.

First and second wireless connection type wireless repeaters 6
The basic configurations of A and 6B are the same as those of the wired connection type wireless repeater 5 described above, except that they are configured to be communicable with the layer 3 type wireless repeater 4 via a wireless line. .

The wireless terminals 7a to 7g are generally known and well-known devices which are composed of a NIC (Network Interface Card) having a wireless transmission / reception function and a computer represented by a portable personal computer. In the configuration shown in FIG. 1, the wireless terminal 7a is under the control of the wired connection type wireless repeater 5, that is, the wireless terminal 7a is located in a state where packets can be exchanged with the wired connection type wireless repeater 5. Has become. Further, the wireless terminals 7b to 7d are under the control of the first wireless connection type wireless relay device 6A, and the wireless terminals 7e to 7e to
7 g is under the control of the second wireless connection-type wireless relay device 6B. In addition, here, "is under control" means
A wireless terminal is within a range where it can communicate with a wireless repeater via a wireless line, and as will be described later, the MAC of the wireless terminal is stored in a predetermined storage area of the wireless relay.
It means a state in which the address is stored together with other information (a VLAN identifier, etc.).

In the embodiment of the present invention, the wired connection type wireless repeater 5 and the first and second wireless connection type wireless repeaters 6A and 6B are terminals on the wireless side, that is, VLAN settings can be made on the wireless terminal. For example, in the wired connection type wireless relay device 5, the wireless terminal 7a is set to the first VLAN (hereinafter referred to as "VLAN1"), and in the first wireless connection type wireless relay device 6A, the wireless terminals 7b and 7c. To VLAN1 and wireless terminal 7
d to the second VLAN (hereinafter referred to as "VLAN2"),
In the second wireless connection type wireless repeater 6B, the wireless terminal 7e is set to the VLAN 2, the wireless terminal 7f,
7g is the third VLAN (hereinafter referred to as "VLAN3")
, Respectively. For this VLAN setting, even if the respective wireless repeaters 5, 6A, 6B are connected to a computer (not shown) by a cable and the respective computers are set to the respective wireless repeaters 5, 6A, 6B, the management It does not matter whether it is performed from the computer 3.

By the setting of the VLAN, the MAC addresses of the subordinate wireless terminals 7a to 7g are stored in the predetermined storage areas of the respective wireless repeaters 5, 6A and 6B.
The correspondence relationship with the VLAN group to which each of the wireless terminals 7a to 7g belongs is stored. In the case of the above example, the correspondence relationships shown in, for example, FIGS. 7A to 7C are stored. Here, the MAC address is expressed as a simple expression for convenience, where “xxxx1” is the MAC address of the wireless terminal 7a, “xxxx2” is the MAC address of the wireless terminal 7b, and “xxxx3” is the wireless terminal 7
c is the MAC address, “xxxx4” is the MAC address of the wireless terminal 7d, and “xxxx5” is the MA of the wireless terminal 7e.
The C address, “xxxx6”, represents the MAC address of the wireless terminal 7f, and “xxxx7” represents the MAC address of the wireless terminal 7g. As described above, the VLAN settings in the wireless relay devices 5, 6A, and 6B according to the embodiment of the present invention are associated with the MAC address to form the VLAN.
It defines a group, and is a so-called MAC address-based VLAN setting.

Next, with reference to FIGS. 2 to 9, the layer 3 type wireless repeater 4, the wired connection type wireless repeater 5, and the first and second wireless connection type wireless repeaters 6 in the above-described configuration.
A procedure of wireless VLAN packet processing executed in A and 6B will be described. In the following explanation,
When the processing is common to the layer 3 type wireless repeater 4, the wired connection type wireless repeater 5, and the first and second wireless connection type wireless repeaters 6A and 6B, these are collectively referred to as a wireless repeater. However, if the process is performed by a specific wireless repeater among the above-described three types, the name of the specific wireless repeater is used. When the process starts
The wireless repeater first enters a packet receiving state, and if a packet is input, the packet is received (see step S010 in FIG. 2). Next, when the packet is received, it is determined whether the received packet is a tagged packet (see step S012 in FIG. 2), and if it is determined that the packet is a tagged packet (YES If it is determined that the packet is not a tagged packet (in the case of NO), the process proceeds to step S028.

Here, the tag added to the packet is
Based on the tagging VLAN function of IEEE802.1Q, the VLAN identifier (VLAN I) added to the packet as illustrated in FIG.
D). FIG. 8 schematically shows a VLAN identifier and the contents of packets before and after the VLAN identifier. In the portion before the VLAN identifier, a destination MAC address and a source (source) MAC address are sequentially arranged from the head side. The destination IP address is arranged after the VLAN identifier.

Returning to FIG. 2 again, if it is determined in the previous step S012 that the packet is a tagged packet (Y
(In the case of ES) means that the packet is a transferred packet. Then, in step S028, the source MAC included in the received packet.
The address (see FIG. 8) will be read. Then, it is determined whether or not there is the source MAC address acquired in step S028 in the search table (see step S030 in FIG. 2). Here, the search table refers to each of the wireless terminals 7a to 6b that are subordinate to each of the wireless relay devices 5, 6A and 6B.
7 illustrates a correspondence relationship between various types of management information of 7 g.
That is, specifically, the management information is, for example, the MAC address of each of the wireless terminals 7a to 7g, the VLAN identifier assigned to identify the VLAN group set on the basis of the MAC address, and the IP address. This is the subnet mask. Then, as the search table, the management information is represented in a format associated with the MAC address, for example, in the format illustrated in FIG. 9, and stored in an appropriate storage area of the wireless relay device. ing. It should be noted that the VLAN identifier is used for the VL when the VLAN is set in the wireless repeaters 5, 6A and 6B as described above.
When the AN group is designated, it may be automatically assigned or may be assigned by so-called manual setting.

If it is determined in step S030 that the source MAC address previously acquired in step S028 exists in the above-mentioned search table (YES).
In the case of), it means that the source of this transfer packet is the wireless terminal under the control of the wireless relay device that originally received this transfer packet, and in that case, it is not necessary to transfer to another terminal. The process of is ended. On the other hand, in step S030, first in step S028.
When it is determined that the source MAC address acquired in step S1 is not in the above-mentioned search table (in the case of NO), it means that the packet is for a subnet other than the VLAN group stored in the wireless relay device. Therefore, first, the destination MAC address is read from the packet received in step S010 (FIG. 2).
See step S032). Next, step S0
It will be determined whether the packet received in 10 is a broadcast packet (see step S034 in FIG. 2). Note that whether or not the received packet is a broadcast packet is, as is generally well known, determined by whether or not the destination MAC address included in the packet is a predetermined code. Has become. If it is determined in step S034 that the received packet is a broadcast packet (YES), the process proceeds to step S402, which will be described later, while it is determined that the packet is not a broadcast packet. (NO
In the case of), the packet is so-called unicast, and therefore, step S3 described later is performed.
The process proceeds to 02. Note that step S302
The subsequent processing will be described later with reference to FIG. 5, and the processing after step S402 will be described later with reference to FIG.

On the other hand, if it is determined in the previous step S012 that the received packet is not a tagged packet (in the case of NO), from the wireless terminal under the control of the wireless repeater in which this processing is being performed. This means that the source MAC address (see FIG. 9) is read from the received packet (see step S014 in FIG. 2). Here, as a case where the wireless relay device receives a packet from a wireless terminal under the wireless relay device, the following form can be considered in the configuration shown in FIG. That is, first, the case where the wireless terminals 7b to 7g transmit to the first or second wireless connection type wireless repeaters 6A and 6B, and the wireless terminal 7a.
May be transmitted to the wired connection type wireless repeater 5. Note that, in the configuration shown in FIG. 1, although not a subordinate wireless terminal, the packet exchanged between the server 2 and the layer 3 type wireless repeater 4 is also an untagged packet. Then, the source MAC acquired in the previous step S014 in the search table (see FIG. 9).
It is determined whether or not there is an address (see step S016 in FIG. 2).

If it is determined in step S016 that the source MAC address obtained in the previous step S014 is found in the search table (in the case of YES), the process proceeds to step S024, which will be described later, while the previous step is executed. If it is determined that the source MAC address acquired in S014 does not exist in the search table (in the case of NO), it means that the packet is from a wireless terminal newly added under the control of this wireless relay device. From step S01
The MAC address acquired in 4 is the management computer 3
To be notified (step S0 in FIG. 2).
18). Here, the case where the new wireless terminal is under the control of the wireless relay device is, for example, in the configuration shown in FIG. 1, when the wireless terminal 7b moves and is controlled by the first wireless connection-type wireless relay device 6A. From the second wireless connection type wireless repeater 6B
This is the case under the control of. Management computer 3
In the above, the MAC address of the wireless terminal transmitted from the wireless relay device is received by the processing of step S018 described above, and a series of information for the MAC address is updated.

That is, in the management computer 3, the MAC address and VLAN of each wireless terminal 7a-7g
Information about the identifier, the IP address, and the subnet is stored in a predetermined storage area like the search table (see FIG. 9) described above. Therefore, for example, when the wireless terminal 7b moves and the wireless relay device to which the wireless terminal 7b belongs changes, and the MAC address of the wireless terminal 7b is received from the wireless relay device that newly belongs in accordance with the process of step S018. In the management computer 3, first, the IP address of the wireless terminal 7b and the new subnet mask of the wireless terminal are read from the received packet in the same manner as in the usual case. Then, in the management computer 3, the read wireless terminal 7
The above-mentioned stored data is rewritten using the new subnet mask of b as the new subnet mask of the wireless terminal 7b. Then, from the management computer 3, the updated contents, that is, M of the wireless terminal 7b
The AC address, the VLAN identifier, the IP address, and the subnet mask will be transmitted to the new wireless relay device to which the wireless terminal 7b belongs. In the processing of steps S018 and S020 described above, as for the transmission / reception of packets performed between the management computer 3 and the wireless relay device, for example, a known / known SNMP (Simple Neighbor) is used.
Twork Management Protocol) is preferred. That is, a well-known / well-known SNMP for the management computer 3
Manager, wireless relay, SNMP agent,
It is preferable to mount each of them.

Now, returning to FIG. 2 again, step S0
At 20, the information transmitted from the management computer 3 is received as described above. That is, M of the wireless terminal that is under the control of the new wireless repeater
The VLAN identifier, IP address, and subnet mask of the wireless terminal, which is associated with the AC address, will be received. Then, the received data is added to the search table (see FIG. 9) of the wireless relay device (see step S022 in FIG. 2). Then the destination MAC
The address will be read from the packet previously received in step S010 (step S024 in FIG. 2).
reference). Subsequently, it is determined whether or not the packet received in the previous S010 is a broadcast packet (see step S026 in FIG. 2), and when it is determined that the received packet is a broadcast packet (YES In the case of), step S20 described later.
On the other hand, when it is determined that the packet is not a broadcast packet (in the case of NO), it means that the packet is unicast, and therefore, the step described later. The process proceeds to S102 (see FIG. 3).

Next, with reference to FIG. 3 for the processing after step S102, with reference to FIG. 4 for the processing after step S202, and with reference to FIG. 5 for the processing after step S302. , Step S40
The processes after the step 2 will be described in order with reference to FIG. First, the process of step S102 and subsequent steps will be described with reference to FIG.
In 02, it is determined in step S026 (see FIG. 2) that the received packet is not a broadcast packet, which means that the received packet is a unicast packet. First, it is determined whether or not the destination MAC address obtained in the previous step S024 (see FIG. 2) exists in the search table of the wireless relay device (see FIG. 3). If it is determined that the destination MAC address is in the search table (YES), it means that the packet is addressed to the wireless terminal under the control of this wireless relay device. The packet is as it is, that is, the tag (VLAN identifier)
Will be transmitted without being added (see step S108 in FIG. 3). On the other hand, if it is determined in step S102 that the destination MAC address acquired in the previous step S024 (see FIG. 2) does not exist in the search table of the wireless relay device (in the case of NO), the packet is transferred. First, the previous step 0
The source MAC address is read from the packet received in step 10 (see step S104 in FIG. 3).

Then, using the source MAC address obtained in step S104 as an index, the VLAN identifier corresponding to this source MAC address is found from the previous search table (see FIG. 9) stored in the wireless relay device. When read, this VLAN identifier is tagged (see FIG. 8) in the previously received packet (see step S010 in FIG. 2).
Is added (see step S106 in FIG. 3) and transmitted for transfer (transfer transmission) (step S10 in FIG. 3).
8), a series of processing is ended. In addition,
Here, when the so-called tagged packet is transmitted from the wireless relay device as described above, the first and second wireless connection-type wireless relay devices 6A and 6B transmit to the layer 3 type wireless relay device 4. Wired connection type wireless repeater 5
From the wired connection type wireless relay device 5 to the layer 3 type wireless relay device 4 and from the layer 3 type wireless relay device 4 to the wired side wireless relay device. Each case may be transmitted to the machine 5.

Next, the processing after step S202 will be described with reference to FIG. In step S202, in step S026 (see FIG. 2),
In response to the determination that the received packet is a broadcast packet, first, step S0
The destination IP address will be read from the packet received at 10 (see FIG. 2). And the destination I
It is determined whether or not there is a wireless terminal belonging to the same subnetwork as the subnetwork to which the wireless terminal having the P address belongs in the search table (see FIG. 9) (see step S204 in FIG. 4). That is, first, as is generally known, the multiplication result of the IP address and the subnet mask contained therein represents a subnet (segment). Therefore, first, in order to know which sub-network the destination IP address acquired in step S202 belongs to, in other words, which subnet it belongs to, a calculation is performed based on the above-mentioned relational expression, and the subnet is calculated. Is required.

Next, each MA in the search table
It is sequentially determined whether or not the subnet of the wireless terminal having the C address and the subnet to which the destination IP address obtained as described above belongs are the same. That is, the IP addresses are selected one by one from the search table, the subnets are calculated by the above-described calculation, and it is determined whether the calculation result and the subnet to which the destination IP address belongs are the same. It Then, when it is determined that they are the same, this determination process is terminated at that time, while when it is determined that they are not the same, the next IP in the search table is determined.
Similar processing is performed for the address. In this way
If it is determined that they are the same (if YES),
On the other hand, if it is determined that the subnet to which any of the IP addresses in the search table belongs is not the same as the subnet to which the destination IP address belongs (in the case of NO), the process proceeds to step S210. Become.

In the determination in step S204, it is determined that a wireless terminal belonging to the same subnetwork as the subnetwork to which the wireless terminal having the destination IP address acquired in step S202 belongs exists in the search table (see FIG. 9). This means that the received packet is a Directed Broadcast. That is, in this case, the received packet is the V to which the wireless terminal that transmitted the packet belongs.
It means that the broadcast is addressed to a VLAN group separate from the LAN group. Then, in this case, not only is it necessary to transfer the packet to another VLAN group, but it is determined YES in the previous step S204 that the wireless terminals belonging to the same sub-network are the wireless relay devices of this wireless relay device. Since it means that the packet belongs to the subordinate, it is necessary to transmit the packet to the radio terminal subordinate to the radio repeater. Therefore, first, in the process in the previous step S204, the VLAN identifier of the wireless terminal determined to match the subnetwork with the subnetwork to which the wireless terminal having the destination IP address acquired in step S202 belongs is searched (see FIG. 8). ) Will be acquired (step S in FIG. 4).
206). Then, in step S216, first, packet transmission is performed to the wireless terminals under the control of this wireless relay device. That is, in this case,
The packet will be transmitted without the VLAN identifier being added.

On the other hand, in the determination of step S204,
It is determined that the wireless terminal belonging to the same sub-network as the sub-network to which the destination IP address acquired in step S202 belongs does not exist in the search table (see FIG. 9) because the received packet is a limited broadcast (Limited Broadcast). Broadcast). That is, in this case, the packet received in step S010 (see FIG. 2) is from a wireless terminal under the control of the wireless relay device, and all other terminals in the VLAN to which the wireless terminal belongs. It means that the packet is sent toward. Therefore, the received packet is transmitted to the wireless terminal belonging to the VLAN group targeted for the limited broadcast under the control of this wireless repeater, and at the same time, the packet is transmitted under the control of another wireless relay under this limited broadcast. Packets need to be forwarded to be sent to the targeted wireless terminal. Therefore, first, the source MAC address is read from the packet received in the previous step 010 (see step S210 in FIG. 4). Then, from the lookup table, the VLAN corresponding to the source MAC address
The identifier, in other words, the VLAN identifier of the VLAN to which the wireless terminal that transmitted the packet belongs is acquired (see step S212 in FIG. 4). Next, it is determined whether or not there are two or more VLAN identifiers acquired in step S212 in the search table, that is, the same VL other than the wireless terminal that transmitted the packet received in step S010.
It is determined whether or not there is another wireless terminal that belongs to the AN group and is under the control of this wireless repeater (see step S214 in FIG. 4).

Then, in step S214, when it is determined that there are two or more VLAN identifiers acquired in step S212 in the search table (in the case of YES),
In step S216, the packet is transmitted to the wireless terminal under the control of the wireless repeater. On the other hand, it is determined that there are no more than two VLAN identifiers acquired in step S212 in the search table, that is, there is no endless terminal having the same VLAN identifier other than the wireless terminal that transmitted the packet received in step S010. If (NO), or after the process of step S216 described above, first, in order to transfer the packet to another wireless relay device, first, the VLAN acquired in step S206 or step S212.
The identifier (see FIG. 8) is added to the transferred packet (see step S218 in FIGS. 8 and 4).
Then, the tagged packet to which the VLAN identifier is added is transferred and transmitted by the wireless relay device (step S220 in FIG. 4).
), A series of processing is ended. Here, as a mode of packet transfer by the wireless relay device, for example, in the configuration shown in FIG. 1, when the wired connection wireless relay device 5 transmits a packet to the LAN trunk line 1, Alternatively, the second wireless connection type wireless repeater 6A, 6B
However, when transmitting to the layer 3 type wireless repeater 4, when the layer 3 type wireless repeater 4 transmits a packet to the LAN trunk line 1, the layer 3 type wireless repeater 4 transmits the first and second radio waves. There may be a case of wireless transmission to the connection type wireless repeaters 6A and 6B.

Next, the processing after step S302 will be described with reference to FIG. In step S302, it is determined whether or not the destination MAC address acquired in the process of the previous step S032 (see FIG. 2) exists in the search table (see FIG. 9). Then, in this step S302, step S032
When it is determined that the destination MAC address acquired in the process of (1) does not exist in the search table (in the case of NO),
This means that there is no wireless terminal to which the received packet should be transmitted under the control of this wireless relay device. Therefore, the packet received in step S010 (see FIG. 2) is directly transmitted (transferred) for transfer. Will be transmitted) (see step S306 in FIG. 5). On the other hand, if it is determined in step S302 that the destination MAC address acquired in the process of step S032 (see FIG. 2) exists in the search table (YES), it is received in step S010 (see FIG. 2). Packet is
This means that it should be transmitted to the wireless terminal under the control of this wireless repeater, so the tag (VLAN identifier) added to the received packet is deleted and the wireless terminal is deleted. (See steps S304 and S306 in FIG. 5), and a series of processing is ended.

Next, the processing after step S402 will be described with reference to FIG. In step S402, in response to the determination that the received packet is a broadcast packet (see step S034 in FIG. 2), the packet is transferred and transmitted to another wireless relay device. Becomes Next, the destination IP address is read from the received packet (see step S404 in FIG. 6), and the wireless terminal belonging to the same subnetwork as the subnetwork to which the wireless terminal having the destination IP address belongs is searched (see FIG. 9).
It is determined whether or not it exists inside (see step S406 in FIG. 6). Note that the specific procedure for determining whether or not a wireless terminal belonging to the same sub-network exists in the search table is first step S204 (see FIG. 4).
Since it is the same as that described in (), the repetitive description here will be omitted.

Then, in step S406, when it is determined that there is a wireless terminal belonging to the same subnetwork as the subnetwork to which the wireless terminal having the destination IP address acquired from the received packet exists in the search table (YES). In this case, since the wireless terminal to which the packet should be sent is under the control of this wireless relay device, the tag (VLAN identifier) added to the received packet is deleted (step S41 in FIG. 6).
2), and is transmitted to the wireless terminal (see step S414 in FIG. 6). On the other hand, step S406
In the case where it is determined that there is no wireless terminal belonging to the same sub-network as the sub-network to which the wireless terminal having the destination IP address acquired from the received packet belongs in the search table (in the case of NO), the packet is As described in step S204 above, the limited broadcast (Limited Broadcas
t). Therefore, first, the VLAN identifier is read from the received packet (step S in FIG. 6).
408), and then it is determined whether or not the VLAN identifier exists in the search table (see step S410 in FIG. 6).

Then, in step S410, the VLAN
When it is determined that the identifier exists in the search table (Y
In the case of ES), it means that the wireless terminal to which the received packet should be sent exists under the control of this wireless relay device, and therefore the tag (VLAN identifier) attached to the received packet is deleted. (Step S412 in FIG. 6)
(Refer to step S414 in FIG. 6), and the series of processes is ended. On the other hand, when it is determined in step S410 that the VLAN identifier does not exist in the search table (in the case of NO), it is not necessary to transmit the packet to the wireless terminal under the control of this wireless relay device, so The processing will be ended.

In this way, the layer 3 type wireless repeater 4,
In the wired connection type wireless repeater 5 and the first and second wireless connection type wireless repeaters 6A and 6B, the wireless VLA as described above is used.
By performing the N packet processing, the mobile terminals 7a to 7g can be freely moved between the wired connection type wireless repeater 5 and the first and second wireless connection type wireless repeaters 6A and 6B. That is, for example, the wireless terminal 7b
Is under the control of the first wireless connection type wireless relay device 6A, in other words, the first wireless connection type wireless relay device 6A.
It is assumed that the packet is transmitted by moving from the state of being located in the communicable range to the range of being communicable with the second wireless connection type wireless repeater 6B. Here, if the first and second wireless connection type wireless repeaters 6A and 6B are conventional wireless repeaters,
That is, it is assumed that it has only the function of simply transferring the packets within the same subnet and does not have the wireless VLAN packet processing function as described with reference to FIGS. 2 to 6. In this case, even if the wireless terminal 7b moves to the communication range of the second wireless connection type wireless repeater 6B and transmits a packet as described above, the first wireless connection type wireless repeater 6A and the second wireless connection type Since the subnet is different from that of the connection-type wireless relay device 6B, conventionally, the communication between the second wireless-connection wireless relay device 6B and the wireless terminal 7b cannot be performed as it is, and the IP address of the wireless terminal 7b can be reset. The communication with the second wireless connection-type wireless relay device 6B becomes possible only by performing the operation.

However, in the embodiment of the present invention, when the wireless terminal 7b moves as described above,
Since the processing after step S014 (see FIG. 2) is executed, the wireless terminal 7b communicates with the second wireless connection type wireless relay device 6B without setting a new IP address unlike the conventional one. It will be possible. Moreover, the movement of the wireless terminal 7b is notified to the management computer 3 (see step S018 in FIG. 2), and as a result,
The management computer 3 can track the position of the wireless terminal 7b. That is, conventionally,
Wireless terminals under the same wireless repeater belong to a single subnet, and wireless terminals belonging to different subnets cannot be under the control of one wireless repeater. On the other hand, in the embodiment of the present invention, it is possible for wireless terminals belonging to different subnets to exist under the control of one wireless repeater.

In the above configuration, when arranging the types of packets exchanged with each other, untagged packets are exchanged between the layer 3 type radio repeater 4 and the server 2, while layer 3 type radios are exchanged. Packets with tags are transmitted and received between the relay device 4 and the management computer 3, and between the layer 3 type wireless relay device 4 and the wired connection type wireless relay device 5, respectively. In addition, a tagged packet is exchanged between the layer 3 type wireless repeater 4 and the first and second wireless connection type wireless repeaters 6A and 6B, and the first and second wireless connection type wireless repeaters 6A are transmitted and received. , 6B
The untagged packet is transmitted and received between and the wireless terminals 7b to 7g. Further, the untagged packet is exchanged between the wired connection type wireless repeater 5 and the wireless terminal 7a.

Next, another configuration example of the wireless LAN system will be described with reference to FIG. The same components as those shown in FIG. 1 are designated by the same reference numerals, detailed description thereof will be omitted, and different points will be mainly described below. In the configuration example shown in FIG. 1 above,
Although the layer 3 type wireless repeater 4 was used, this layer 3 type wireless repeater 4 is not always necessary, and as the wireless repeater, only the wired connection type wireless repeaters 5a and 5b are connected to the LAN trunk line 1. It may have a different form (Fig. 1
0). That is, the wired connection type wireless repeaters 5a and 5b
Has the same function as the wired connection type wireless repeater 5 in the configuration example shown in FIG. Note that the packet processing by the wired connection type wireless repeaters 5a and 5b in such a configuration is basically the same as that described above with reference to FIGS. 2 to 9, and thus the detailed description thereof will be repeated here. Will be omitted.

[0036]

As described above, according to the present invention,
In a wireless repeater in a wireless LAN system, when a received packet is transmitted to a wireless terminal under it,
When the packet has a tag, the tag is deleted and transmitted, while when the packet is transferred, the VLAN is used.
Since it is determined whether or not an identifier needs to be added, and if necessary, a VLAN identifier is added so that the packet can be transferred, so that packet processing without a problem in the VLAN can be realized. Thus, the wireless terminals having different subnets can exist under the control of one wireless repeater, and the wireless VLAN system can be realized in which the original functions of the wireless LAN can be fully utilized. Further, according to the present invention,
Unlike the conventional case, even if the wireless terminal moves and becomes a subordinate of a different wireless repeater, there is no need to re-set the IP address as in the conventional case, and a convenient wireless VLAN system can be provided. It plays. Furthermore, since the wireless repeater determines whether or not the packet should be transmitted to the wireless terminals under its control and performs packet processing, generation of unnecessary traffic is suppressed and efficient packet exchange is performed. Is played. Furthermore, even if the wireless terminal moves and is under the control of a different wireless relay station, it is not necessary to change the VLAN group, so that so-called security can be ensured more reliably and more reliably than ever before. It is effective.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a configuration example of a wireless LAN system according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a procedure in the first half of the wireless VLAN packet processing according to the embodiment of the present invention.

FIG. 3 is a flowchart showing a procedure after step S102 in the latter half of the wireless VLAN packet processing according to the embodiment of the present invention.

FIG. 4 is a flowchart showing a procedure after step S202 in the latter half of the wireless VLAN packet processing according to the embodiment of the present invention.

FIG. 5 is a flowchart showing a procedure after step S302 in the latter half of the wireless VLAN packet processing according to the embodiment of the present invention.

FIG. 6 is a flowchart showing a procedure after step S402 in the latter half of the wireless VLAN packet processing according to the embodiment of the present invention.

FIG. 7 is an explanatory diagram showing an example of correspondence between a MAC address and a VLAN group stored in a wireless relay device in a MAC address-based VLAN setting, and FIG. Explanatory diagram to explain,
FIG. 7B is an explanatory diagram for explaining the stored contents in the first wireless connection type wireless relay device, and FIG. 7C is an explanatory diagram for explaining the stored contents in the second wireless connection type wireless relay device. is there.

FIG. 8 is a schematic diagram schematically showing a VLAN identifier and the contents of packets before and after the VLAN identifier.

FIG. 9 is a schematic diagram schematically showing the contents of a search table stored in a wireless relay device.

FIG. 10 is a configuration diagram showing another configuration example of the wireless VLAN system according to the embodiment of the present invention.

[Explanation of symbols]

1 ... LAN trunk line 2 ... server 3 ... Management computer 4 ... Layer 3 type wireless repeater 5 ... Wired connection type wireless repeater 6A ... First wireless connection type wireless repeater 6B ... First wireless connection type wireless repeater 7a to 7g ... Wireless terminal

   ─────────────────────────────────────────────────── ─── Continued front page    (54) [Title of Invention] VLAN construction method in wireless LAN, VLAN packet processing program for wireless relay device, wireless                     Recording medium for recording VLAN packet processing program for relay, wireless repeater having VLAN function                     And wireless VLAN system

Claims (35)

[Claims] 1. An LA in which network devices are connected by wire
A wireless VLAN construction method in a wireless LAN system in which a wireless terminal is provided on an N trunk line via a wireless relay so as to be able to send and receive packets to and from a wired side, wherein the wireless terminal under the wireless relay is subordinate to the wireless terminal. For setting the VLAN group based on the MAC address and storing the management information of the wireless terminal, the wireless relay device determines whether the received packet is tagged and tagged. If it is determined that the packet is unicast and should be transmitted to the wireless terminal under the control, the tag is removed from the packet, the packet is transmitted, and the packet is broadcast. In some cases, the packet should be forwarded and transmitted to the wireless terminal under the packet. Expediently, while transmitting to remove the tag from the packet, in the determination the received packet whether it is tagged, when it is determined not to be tagged,
If the untagged packet is unicast,
Based on the destination MAC address of the packet, the corresponding VLAN identifier is acquired from the management information, added to the packet and transferred, and if the untagged packet is a broadcast, based on the destination IP address of the packet. The corresponding VLAN identifier is acquired from the management information, added to the packet, and transferred to the wireless V
A wireless L characterized by enabling the construction of a LAN
VLAN construction method in AN system. 2. The method for constructing a VLAN in a wireless LAN system according to claim 1, wherein the management information is a VLAN identifier associated with a MAC address of the wireless terminal, an IP address and a subnet mask. 3. The received packet is tagged and
In the case of broadcast, whether or not the packet should be transmitted to the subordinate wireless terminal is determined in the management information by the wireless terminal belonging to the same subnetwork as the subnetwork to which the destination IP address of the packet belongs. 3. The packet is to be transmitted to a subordinate wireless terminal when it is determined that the corresponding wireless terminal is present in the management information. V in the wireless LAN system of
LAN construction method. 4. In determining whether or not a wireless terminal belonging to the same subnetwork as the subnetwork to which the destination IP address of the packet belongs exists in the management information, it is determined that the corresponding wireless terminal does not exist in the management information. If so, obtain the VLAN identifier from the packet,
It is determined whether the VLAN identifier is present in the management information, and if it is determined that the VLAN identifier is present in the management information, the packet should be transmitted to the wireless terminal under the control. 4. The method according to claim 3, wherein
A method for constructing a VLAN in the described wireless LAN system. 5. When the received packet is an untagged packet and is unicast, the transfer of the packet added with the VLAN identifier obtained based on the destination MAC address of the packet is the received packet. It is determined whether the destination MAC address of the packet is present in the management information, and when it is determined that the destination MAC address is not present in the management information, the VLAN identifier management based on the destination MAC address is performed. The acquisition from the management information is performed by acquiring the source MAC address from the received packet and then acquiring the VLAN identifier corresponding to the source MAC address from the management information. The wireless LAN according to claim 3.
VLAN construction method in system. 6. A VLAN acquired based on a destination IP address of a packet when the received packet is an untagged packet and is a broadcast.
The transfer of the packet added with the identifier determines whether or not a wireless terminal belonging to the same sub-network as the sub-network to which the destination IP address belongs is present in the management information, and the corresponding wireless terminal is identified in the management information. 6. The VLAN identifier of the wireless terminal is acquired from the management information, and the acquired VLAN identifier is added to the untagged packet. A method for constructing a VLAN in a wireless LAN system. 7. A VLAN acquired based on a destination IP address of a packet when the received packet is an untagged packet and is a broadcast.
When it is determined that a wireless terminal belonging to the same sub-network as the sub-network to which the destination IP address belongs does not exist in the management information, the packet with the added identifier is transferred from the untagged packet with the source MAC address. 7. The method according to claim 6, further comprising: acquiring, then acquiring a VLAN identifier corresponding to the transmission source MAC address from the management information, and adding the acquired VLAN identifier to the untagged packet. A method for constructing a VLAN in a wireless LAN system. 8. An LA in which network equipment is connected by wire
A wireless repeater VLAN that is executed in the wireless repeater to construct a wireless VLAN in a wireless LAN system in which a wireless terminal is provided on the N trunk line via a wireless repeater so as to be able to exchange packets with the wired side. A packet processing program, wherein in the wireless relay device, it is possible to set a VLAN group for a wireless terminal under its control based on a MAC address, and management information of the wireless terminal is stored as a search table, In the relay machine, determine whether the received packet is tagged or not.If it is determined that the packet is tagged, the packet is unicast and should be transmitted to the wireless terminal under its control. If so, remove the tag from the packet and send the packet, Is a broadcast, the packet is transferred, and when the packet is to be transmitted to a wireless terminal under the packet, the tag is deleted from the packet and the packet is transmitted, while the received packet is transmitted. When it is determined whether or not is tagged, it is determined that it is not tagged,
If the untagged packet is unicast,
Based on the destination MAC address of the packet, the corresponding VLAN identifier is acquired from the management information and added to the packet to be transferred. If the untagged packet is a broadcast, the destination IP of the packet
A VLAN packet processing program for a wireless repeater, characterized in that a corresponding VLAN identifier is acquired from the management information based on an address and is added to a packet and transferred. 9. The VLAN packet processing program for a wireless repeater according to claim 8, wherein the management information is a VLAN identifier associated with a MAC address of the wireless terminal, an IP address and a subnet mask. 10. The sub-network to which the destination IP address of the packet belongs is determined whether or not the packet should be transmitted to a wireless terminal under the control when the received packet is tagged and broadcast. If it is determined that a wireless terminal belonging to the same sub-network exists in the management information, and it is determined that the corresponding wireless terminal exists in the management information,
10. The VLAN for a wireless relay device according to claim 9, wherein the packet is to be transmitted to a wireless terminal under the control of the packet.
Packet processing program. 11. In determining whether or not a wireless terminal belonging to the same subnetwork as the subnetwork to which the destination IP address of the packet belongs is present in the management information,
When it is determined that the corresponding wireless terminal does not exist in the management information, the VLAN identifier is acquired from the packet, and it is determined whether the VLAN identifier exists in the management information. 11. The VLAN packet processing program for a wireless relay device according to claim 10, wherein when it is determined that the packet exists in the management information, the packet should be transmitted to a wireless terminal under the control. 12. A VLAN obtained based on a destination MAC address of a packet when the received packet is an untagged packet and is unicast.
The transfer of the packet to which the identifier is added determines whether or not the destination MAC address of the received packet is present in the management information, and is performed when it is determined that the destination MAC address is not present in the management information. I said the destination M
The acquisition of the VLAN identifier based on the AC address from the management information means the transmission source MAC from the received packet.
12. An address is acquired, and then, a VLAN identifier corresponding to the transmission source MAC address is acquired from the management information.
The described VLAN packet processing program for a wireless repeater. 13. A VLA obtained based on a destination IP address of a packet when the received packet is an untagged packet and is a broadcast.
The transfer of the packet with the N identifier is performed by determining whether a wireless terminal belonging to the same subnetwork as the subnetwork to which the destination IP address belongs is present in the management information, and the corresponding wireless terminal manages the management information. If it is determined that the wireless terminal exists in the information, the VLAN of the wireless terminal
13. The wireless relay device V according to claim 12, wherein an identifier is acquired from the management information, and the acquired VLAN identifier is added to the untagged packet.
LAN packet processing program. 14. A VLA obtained based on a destination IP address of a packet when the received packet is an untagged packet and is a broadcast.
When it is determined that a wireless terminal belonging to the same subnetwork as the subnetwork to which the destination IP address belongs does not exist in the management information, the packet with the N identifier is transferred from the untagged packet to the source MAC.
The address is acquired, then, the VLAN identifier corresponding to the source MAC address is acquired from the management information, and the acquired VLAN identifier is added to the untagged packet.
3. The VLAN packet processing program for a wireless repeater described in 3. 15. An L connected to a network device by wire.
A wireless repeater VLAN that is executed in the wireless repeater in order to construct a wireless VLAN in a wireless LAN system in which a wireless terminal is provided on the AN trunk line via a wireless repeater so as to be able to send and receive packets to and from the wired side. A recording medium in which a packet processing program is recorded, wherein a VLAN group can be set on the wireless terminal under the wireless relay device based on a MAC address, and management information of the wireless terminal is stored as a search table. On the other hand, in the wireless relay device, it is determined whether or not the received packet is tagged, and when it is determined that the packet is tagged, the packet is unicast and is transmitted to the wireless terminal under the packet. If so, remove the tag from the packet and send the packet. If the packet is broadcast, the packet is transferred, and if the packet is to be transmitted to a wireless terminal under the packet, the tag is deleted from the packet and the packet is transmitted. In the determination of whether or not the received packet is tagged, when it is determined that it is not tagged,
If the untagged packet is unicast,
Based on the destination MAC address of the packet, the corresponding VLAN identifier is acquired from the management information and added to the packet to be transferred. If the untagged packet is a broadcast, the destination IP of the packet
A recording medium recording a computer-readable VLAN packet processing program for a wireless repeater, wherein a corresponding VLAN identifier is acquired from the management information based on an address, added to a packet, and transferred. 16. The computer-readable VLAN for a wireless repeater according to claim 15, wherein the management information is a VLAN identifier associated with a MAC address of the wireless terminal, an IP address and a subnet mask.
A recording medium recording a packet processing program. 17. A sub-network to which a destination IP address of a packet belongs, whether the packet should be transmitted to a wireless terminal under the packet when the received packet is tagged and broadcast. If it is determined that a wireless terminal belonging to the same sub-network exists in the management information, and it is determined that the corresponding wireless terminal exists in the management information,
The recording medium storing the computer-readable VLAN packet processing program for a wireless relay device according to claim 16, wherein the packet is to be transmitted to a wireless terminal under the packet. 18. In determining whether or not a wireless terminal belonging to the same subnetwork as the subnetwork to which the destination IP address of the packet belongs is present in the management information,
When it is determined that the corresponding wireless terminal does not exist in the management information, the VLAN identifier is acquired from the packet, and it is determined whether the VLAN identifier exists in the management information. 18. The computer-readable VLAN packet processing program for a wireless repeater according to claim 17, wherein when it is determined that the packet exists in the management information, the packet should be transmitted to a wireless terminal under the packet. A recording medium on which is recorded. 19. A VLAN acquired based on a destination MAC address of a packet when the received packet is an untagged packet and is unicast.
The transfer of the packet to which the identifier is added determines whether or not the destination MAC address of the received packet is present in the management information, and is performed when it is determined that the destination MAC address is not present in the management information. I said the destination M
The acquisition of the VLAN identifier based on the AC address from the management information means the transmission source MAC from the received packet.
19. The process is performed by obtaining an address, and then obtaining a VLAN identifier corresponding to the source MAC address from the management information.
VLA for computer-readable wireless repeater described
A recording medium recording an N-packet processing program. 20. A VLA obtained based on a destination IP address of a packet when the received packet is an untagged packet and is a broadcast
The transfer of the packet with the N identifier is performed by determining whether a wireless terminal belonging to the same subnetwork as the subnetwork to which the destination IP address belongs is present in the management information, and the corresponding wireless terminal manages the management information. If it is determined that the wireless terminal exists in the information, the VLAN of the wireless terminal
20. The computer-readable VLAN packet processing program for a wireless repeater according to claim 19, wherein an identifier is acquired from the management information, and the acquired VLAN identifier is added to the untagged packet. Recording medium. 21. A VLA obtained based on a destination IP address of a packet when the received packet is an untagged packet and is a broadcast
When it is determined that a wireless terminal belonging to the same subnetwork as the subnetwork to which the destination IP address belongs does not exist in the management information, the packet with the N identifier is transferred from the untagged packet to the source MAC.
3. An address is acquired, then a VLAN identifier corresponding to the source MAC address is acquired from the management information, and the acquired VLAN identifier is added to the untagged packet.
VL for computer-readable wireless repeater
A recording medium recording an AN packet processing program. 22. An L connected to a network device by wire
A wireless repeater in a wireless LAN system in which a wireless terminal is provided on the AN trunk line via a wireless repeater so as to be able to send and receive packets to and from the wired side, and the wireless repeater is a wireless terminal under its control. About MAC
While the VLAN group can be set based on the address and the management information of the wireless terminal can be stored, the wireless relay device determines whether the received packet is tagged. In the case where it is determined that the packet is tagged, the packet is unicast and should be transmitted to the wireless terminal under the packet, the tag is deleted from the packet, and the packet is transmitted. When the packet is broadcast, the packet is transferred, and when the packet is to be transmitted to a wireless terminal under the packet, the tag is deleted from the packet and transmitted, while the reception When it is determined that the packet that has been tagged is not tagged,
If the untagged packet is unicast,
Based on the destination MAC address of the packet, the corresponding VLAN identifier is acquired from the management information, added to the packet and transferred, and if the untagged packet is a broadcast, based on the destination IP address of the packet. A wireless repeater having a VLAN function, which is configured to obtain a corresponding VLAN identifier from the management information, add it to a packet, and transfer the packet. 23. The wireless repeater having a VLAN function according to claim 22, wherein the management information is a VLAN identifier, an IP address and a subnet mask associated with the MAC address of the wireless terminal. 24. If the received packet is tagged and broadcast, it is determined whether the packet should be transmitted to a wireless terminal under the subnetwork to which the destination IP address of the packet belongs. It is determined whether or not a wireless terminal belonging to the same sub-network exists in the management information, and when it is determined that the corresponding wireless terminal exists in the management information, the packet is transmitted to the wireless terminal under the control. 24. The wireless repeater having a VLAN function according to claim 23, which is to be transmitted. 25. In determining whether or not a wireless terminal belonging to the same subnetwork as the subnetwork to which the destination IP address of the packet belongs is present in the management information,
When it is determined that the corresponding wireless terminal does not exist in the management information, the VLAN identifier is acquired from the packet, it is determined whether the VLAN identifier exists in the management information, and the VLAN identifier is 25. The wireless repeater having a VLAN function according to claim 24, wherein when it is determined that the packet exists in the management information, the packet should be transmitted to a wireless terminal under the control of the packet. 26. A VLAN obtained based on a destination MAC address of a packet when the received packet is an untagged packet and is unicast
The transfer of the packet added with the identifier is performed when it is determined whether or not the destination MAC address of the received packet is present in the management information, and when it is determined that the destination MAC address is not present in the management information. The destination MAC
The acquisition of the VLAN identifier based on the address from the management information means acquiring the source MAC address from the received packet and then acquiring the VLAN identifier corresponding to the source MAC address from the management information. 26. The VLA of claim 25, characterized in that
A wireless repeater having an N function. 27. A VLA obtained based on a destination IP address of a packet when the received packet is an untagged packet and is a broadcast
The transfer of the packet to which the N identifier is added determines whether or not a wireless terminal belonging to the same subnetwork as the subnetwork to which the destination IP address belongs is present in the management information. If it is determined that the VLAN identifier of the wireless terminal exists, the VLAN identifier of the wireless terminal is acquired from the management information, and the acquired VLAN is acquired.
27. The wireless repeater having a VLAN function according to claim 26, wherein an identifier is added to the untagged packet. 28. The VLA obtained based on the destination IP address of a packet when the received packet is an untagged packet and is a broadcast
When it is determined that a wireless terminal belonging to the same subnetwork as the subnetwork to which the destination IP address belongs does not exist in the management information, the packet with the N identifier is transferred from the untagged packet to the source MAC.
An address, and then a VLAN identifier corresponding to the source MAC address from the management information,
28. The wireless repeater having a VLAN function according to claim 27, wherein the acquired VLAN identifier is added to the untagged packet. 29. An L connected to a network device by wire
23. A wireless VLAN system in which a wireless terminal is provided on the AN trunk line via a wireless relay so as to be able to send and receive packets to and from the wired side, wherein the wireless relay has a wireless function with a VLAN according to claim 22. A wireless VLAN system, which is a repeater. 30. An L connected to a network device by wire
24. A wireless VLAN system in which a wireless terminal is provided on an AN trunk line via a wireless relay so as to be able to send and receive packets to and from a wired side, wherein the wireless relay has a wireless LAN function according to claim 23. A wireless VLAN system, which is a repeater. 31. An L connected to a network device by wire
A wireless VLAN system in which a wireless terminal is provided on the AN trunk line via a wireless relay so as to be able to send and receive packets to and from the wired side, wherein the wireless relay has a wireless function with a VLAN according to claim 24. A wireless VLAN system, which is a repeater. 32. An L in which a network device is connected by wire
26. A wireless VLAN system in which a wireless terminal is provided on an AN trunk line via a wireless relay device so as to be able to send and receive packets to and from a wired side, wherein the wireless relay device has a VLAN function according to claim 25. A wireless VLAN system, which is a repeater. 33. An L connected to a network device by wire
27. A wireless VLAN system in which a wireless terminal is provided on an AN trunk line so as to be able to send and receive packets to and from a wired side via a wireless repeater, wherein the wireless repeater has a VLAN function according to claim 26. A wireless VLAN system, which is a repeater. 34. An L in which a network device is connected by wire
A wireless VLAN system in which a wireless terminal is provided on the AN trunk line via a wireless relay so as to be able to send and receive packets to and from the wired side, wherein the wireless relay has a wireless function with a VLAN according to claim 27. A wireless VLAN system, which is a repeater. 35. An L in which a network device is connected by wire
29. A wireless VLAN system in which a wireless terminal is provided on an AN trunk line via a wireless relay so as to be able to send and receive packets to and from a wired side, wherein the wireless relay has a wireless function with a VLAN function according to claim 28. A wireless VLAN system, which is a repeater.