JP2004147159A - Wireless lan system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wireless LAN system, which is superior in utilization efficiency of wireless band and has a function of connecting a wireless terminal to a cable LAN and a wireless bridge function of connecting access points with each other without preparing individual access points. <P>SOLUTION: The system has a plurality of access points 1, 2 and the like connecting the cables LAN 7, 8 and the wireless LAN, in which one access point 1 is set to a master access point and the remaining access point 2 is set to a slave access point as a station. The master access point has an MAC address lookup table, showing the correspondence between the MAC address of the slave access point and the MAC address of a cable terminal connected to the slave access point, and constructs a predetermined wireless packet header, based on the MAC address lookup table and transmits it wirelessly, when the MAC address of a transmission destination is the MAC address written on the MAC address lookup table. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a wireless LAN system used in homes, small offices, and the like.
[0002]
[Prior art]
In recent years, networking has progressed in offices and homes, and a wired LAN system in which a plurality of personal computers, printers, and the like are connected by Ethernet (R) or the like has been constructed. On the other hand, wireless networks are attracting attention due to the complexity of wiring when changing the layout, the difficulty of new wiring, and the ease of portability. In particular, the transmission rate of 11 Mbps, which is equivalent to that of wired, is standardized by IEEE 802.11b. As a result, wireless LAN systems are being introduced at lower cost than before. In IEEE802.11b, Adhoc mode (ad hoc mode) for communication between wireless terminals, Infrastructure mode (infrastructure mode) for communication between wired and wireless terminals via a bridge with a wired LAN called an access point, access There is a Wireless Distribution System mode (wireless distribution system mode, WDS mode) applied to communication between points. In IEEE802.11b, a difference between these communication modes is distinguished by two flags in a wireless packet header. The source and destination are determined by the four address areas.
[0003]
FIG. 7 is a data diagram showing a communication mode, two flags corresponding to the communication mode, and the contents of each address area.
[0004]
In FIG. 7, at the time of communication, the wireless terminal and the access point set two flags, “From DS” and “To DS” in the wireless packet header, and set predetermined address information in the address area. The reception side checks the flag and the MAC (Media Access Control) address in the address area to determine whether the packet is addressed to itself.
[0005]
FIG. 8 is a block diagram showing a conventional wireless LAN system.
[0006]
8, reference numerals 51, 52, and 56 denote access points, 53 and 57 denote wired terminals, 54 and 55 denote wireless terminals, and 58 and 59 denote wired LANs.
[0007]
In the wireless LAN system configured as described above, the access point 51 has a function of connecting the wireless terminal 54 and the wireless terminal 55 to the wired LAN 58, and the access point 52 and the access point 56 connect the wired LAN 58 and the wired LAN 59. It has the function of a wireless bridge for connection. (For example, see Patent Document 1).
[0008]
[Patent Document 1]
JP-A-2000-232549
[0009]
[Problems to be solved by the invention]
As shown in FIG. 8, the contents of the flag and the address area are completely different between the infrastructure mode in which the wireless terminals 54 and 55 are connected to the wired LAN 58 and the WDS mode in which the access points 52 and 56 are connected. The user had to select which mode to operate, such as operating the access point 51 in the infrastructure mode and operating the access point 52 and the access point 56 in the WDS mode. Therefore, there has been a problem that the access point for each communication mode must be separately prepared in the wired LAN 58. There is also a system that employs a method in which an infrastructure mode and a WDS mode are mounted on one access point. However, two communication modes are always operating. For example, when the access point receives an ARP (Address Resolution Protocol) from a wired LAN side. ) Is required to be transmitted in both communication modes, such as to a terminal connected in the infrastructure mode and to a terminal connected in the WDS mode. There is a problem that the efficiency of use of the wireless band is low due to the transmission / reception processing.
[0010]
This wireless LAN system is required to have a function of connecting wireless terminals to a wired LAN without preparing separate access points and a wireless bridge function of connecting access points with each other, with excellent wireless band use efficiency. ing.
[0011]
In order to satisfy this demand, the present invention has a function of connecting a wireless terminal to a wired LAN without preparing a separate access point, and a function of connecting wireless LAN terminals to each other without preparing separate access points. An object is to provide a wireless LAN system.
[0012]
[Means for Solving the Problems]
In order to solve the above problems, a wireless LAN system according to the present invention is a wireless LAN system having a plurality of access points for connecting a wired LAN and a wireless LAN, a wireless terminal, and a wired terminal. One of the access points is set as a parent access point, the remaining access points other than the parent access point are set as child access points as stations, and the parent access point has a MAC address of the child access point and a child access point. A MAC address correspondence table indicating correspondence with the MAC address of the wired terminal connected to the point, and the destination MAC address stored in the second layer packet header area of the received packet is described in the MAC address correspondence table. In the case of address, prescribed based on MAC address correspondence table It has a configuration that wirelessly transmits to build a wireless packet header.
[0013]
As a result, a wireless LAN system having excellent wireless band utilization efficiency and having a function of connecting a wireless terminal to a wired LAN without preparing separate access points and a wireless bridge function of connecting access points to each other can be obtained.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
A wireless LAN system according to claim 1 of the present invention is a wireless LAN system having a plurality of access points for connecting a wired LAN and a wireless LAN, a wireless terminal, and a wired terminal. One of the access points is set as a parent access point, the remaining access points other than the parent access point are set as child access points as stations, and the parent access point has a MAC address of the child access point and a child access point. Has a MAC address correspondence table indicating the correspondence with the MAC address of the wired terminal connected to the MAC address, and the destination MAC address stored in the second layer packet header area of the received packet is the MAC address described in the MAC address correspondence table In the case of, the specified wireless Building a Ttohedda is obtained by the fact that radio transmission.
[0015]
According to this configuration, the wireless packet header is configured using the MAC address correspondence table of the parent access point, and the child access point operates as a station. Therefore, the parent access point only needs to support only the infrastructure mode, and the WDS mode , It is possible to efficiently use the wireless band without sending out extra wireless packets, and connect a wireless terminal to a wired LAN without preparing another access point for a wireless bridge. This has the function of having a function and a wireless bridge function for connecting access points.
[0016]
3. The wireless LAN system according to claim 2, wherein the parent access point automatically extracts the MAC address of the wired terminal connected to the child access point from the packet received from the wireless LAN, and acquires the MAC address of the child access point and the child access point. Automatically generates a correspondence table with the MAC addresses of the wired terminals connected to the terminal.
[0017]
With this configuration, there is an effect that the user does not need to manually set the MAC address correspondence table, and can easily set the MAC address correspondence table.
[0018]
The wireless LAN system according to claim 3 is a wireless LAN system having a plurality of access points for connecting a wired LAN and a wireless LAN, a wireless terminal, and a wired terminal, wherein one of the plurality of access points is provided. One access point is set as a parent access point, the remaining access points other than the parent access point are set as child access points as stations, and the parent access point and the child access point are configured with the MAC address of the child access point and the child access point. A MAC address correspondence table indicating correspondence with the MAC address of the wired terminal connected to the point, and the destination MAC address stored in the second layer packet header area of the received packet is described in the MAC address correspondence table. For addresses, refer to the MAC address correspondence table. Building a predetermined wireless packet header can is obtained by the fact that radio transmission.
[0019]
With this configuration, the parent access point or the child access point configures a wireless packet header using the MAC address correspondence table of the parent access point, and the parent access point only needs to support only the infrastructure mode. Since it does not need to operate, it is possible to use the wireless band efficiently without emitting extra wireless packets, and to connect a wireless terminal to a wired LAN without preparing another access point for a wireless bridge. And a wireless bridge function for connecting the access points to each other.
[0020]
According to a fourth aspect of the present invention, in the wireless LAN system according to the third aspect, the parent access point automatically extracts a MAC address of a wired terminal connected to the child access point from a packet received from the wireless LAN. Automatically generates a correspondence table between the MAC address of the child access point and the MAC address of the wired terminal connected to the child access point, performs communication with the child access point at a predetermined time, and stores the MAC address correspondence table in the child access point. It is to be transmitted to.
[0021]
With this configuration, it is not necessary for the user to manually set the MAC address correspondence table, and particularly, there is an effect that the MAC address correspondence table can be easily set at the child access point.
[0022]
A wireless LAN system according to claim 5, wherein in the wireless LAN system according to claim 2 or 4, the parent access point performs timer management of a MAC address correspondence table, and the wired terminal described in the MAC address correspondence table. If there is no packet for a fixed time, the information of the wired terminal for which there is no packet for a fixed time is deleted from the MAC address correspondence table.
[0023]
With this configuration, even if the user moves the wired terminal, the information is updated as needed, and normal communication can always be performed, so that a user-friendly system can be constructed.
[0024]
Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 6.
[0025]
(Embodiment 1)
FIG. 1 is a block diagram showing a wireless LAN system according to Embodiment 1 of the present invention.
[0026]
In FIG. 1, 1 and 2 are access points, 3 and 4 are wireless terminals, 5 and 6 are wired terminals, and 7 and 8 are wired LANs. The plurality of access points 1 and 2, the wired terminals 5 and 6, and the wireless terminals 3 and 4 constitute a wireless LAN system. Here, the MAC address of each device is set to AA: AA: AA: AA: AA: 01 for the access point 1, the AA: AA: AA: AA: AA: 02 for the access point 2, and the BB: BB for the wireless terminal 3: BB: BB: BB: 01, wireless terminal 4 is BB: BB: BB: BB: BB: 02, wired terminal 5 is CC: CC: CC: CC: CC: 01, wired terminal 6 is CC: CC: CC: CC: CC: 02.
[0027]
In the present embodiment, the access point 1 is set as a parent access point, and stores therein a correspondence table between the MAC address of the access point 2 which is a child access point and the MAC address of the wired terminal 6 connected to the access point 2. The access point 2 is set as a child access point and configured to operate as an infrastructure mode station, that is, one wireless terminal, while configuring the wireless packet header using the MAC address correspondence table. As a result, the access point 1 has a function of connecting the wireless terminals 3 and 4 to the wired LAN 7, and communicates with the access point 2 to connect the wired LAN 7 and the wired LAN 8. Function.
[0028]
Next, the operation of the wireless LAN system in FIG. 1 will be described with reference to FIGS. FIG. 2 is a data diagram showing a correspondence table between the MAC address of the child access point set in the parent access point and the MAC address of the wired terminal connected to the child access point in the wireless LAN system. And (b) show two flags in the wireless packet header when transmitting and receiving a packet between the wired terminal 5 connected to one wired LAN 7 and the wired terminal 6 connected to the other wired LAN 8. FIG. 4 is a data diagram showing an address area and a second layer MAC address. The correspondence table between the MAC address of the child access point and the MAC address of the wired terminal connected to the child access point may be manually set by the user in advance for the parent access point.
[0029]
First, when the wired terminal 5 transmits a packet to the wired terminal 6 (FIG. 3A), the wired terminal 5 transmits an Ethernet (R) packet in which the MAC address of the wired terminal 6 is entered in the destination MAC address. . The access point 1 having received the Ethernet (R) packet from the wired terminal 5 checks the destination address of the second layer MAC address of the received Ethernet (R) packet, and determines that the destination of the Ethernet (R) packet is "CC". : CC: CC: CC: CC: 02 ”while recognizing that the terminal has the MAC address, searching the MAC address correspondence table, and having the MAC address of“ CC: CC: CC: CC: CC: 02 ”. The terminal knows that it is a wired terminal connected to the access point 2. Therefore, the access point 1 sets the “From DS” flag based on the MAC address correspondence table and sets the transmission destination address in the address area of the wireless packet header to the MAC address “AA: AA: AA: AA: AA: AA” of the access point 2. : 02 "is formed and transmitted. The access point 2 understands that it is a wireless packet addressed to itself from the contents of the address area of the wireless packet header, receives this wireless packet, removes the wireless packet header, and transmits the Ethernet (R) packet to the wired LAN 8. Send to Thus, the wired terminal 6 can receive the packet from the wired terminal 5.
[0030]
Next, a case where a packet is transmitted from the wired terminal 6 to the wired terminal 5 (FIG. 3B) will be described.
[0031]
The wired terminal 6 transmits an Ethernet (R) packet in which the MAC address of the wired terminal 5 is entered in the destination MAC address. The access point 2 sets the “To DS” flag, configures a wireless packet header in which the own MAC address “AA: AA: AA: AA: AA: 02” is entered in the source address, and sets the wireless packet header from the wired LAN 8 side. An Ethernet (R) packet is transmitted to the wireless side. This is because the wireless Ack from the access point 1 for the wireless packet from the access point 2 is normally transmitted to the access point 2 since the access point 2 operates as a station. The access point 1 that has received the wireless packet removes the wireless packet header and transmits the Ethernet (R) packet to the wired LAN 7. Thus, the wired terminal 5 can receive the packet from the wired terminal 6.
[0032]
As described above, by configuring the wireless packet header using the MAC address correspondence table in the parent access point 1 and operating the child access point 2 as a station, the parent access point 1 supports only the infrastructure mode. Since there is no need to operate in the WDS mode, it is possible to use the wireless band efficiently without sending out extra wireless packets, and it is not necessary to prepare another access point for the wireless bridge.
[0033]
When a terminal normally performs communication, it broadcasts an ARP packet and associates an IP address with a MAC address in response to the ARP packet. Therefore, using the exchange of the packets, the parent access point 1 automatically extracts the MAC address of the wired terminal connected to the child access point 2 from the packet received from the wireless LAN side, and associates the MAC address of the child access point with the child address. By automatically generating the correspondence table with the MAC address of the wired terminal connected to the access point, it is not necessary for the user to manually set the MAC address correspondence table, and it is possible to provide a very convenient wireless LAN system. it can.
[0034]
Further, by managing the automatically generated MAC address correspondence table by timer, if there is no packet related to the wired terminal described in the MAC address correspondence table for a certain period of time, the information of the wired terminal is deleted from the MAC address correspondence table. Accordingly, it is possible to always perform normal communication even if the user moves the wired terminal to another wired LAN.
[0035]
Further, the MAC address management table can be held by the wireless unit firmware in the access point, or can be held by the wireless driver.
[0036]
(Embodiment 2)
FIG. 4 is a block diagram showing a wireless LAN system according to Embodiment 2 of the present invention.
[0037]
In FIG. 4, reference numerals 11, 12, and 13 denote access points, 14 and 15 denote wireless terminals, 16, 17, and 18 denote wired terminals, and 19, 20, and 21 denote wired LANs. The plurality of access points 11 to 13, the wired terminals 16 to 18, and the wireless terminals 14, 15 constitute a wireless LAN system. Here, the access point 11 sets the MAC address of each device to AA: AA: AA: AA: AA: 01, the access point 12 AA: AA: AA: AA: AA: 02, and the access point 13 AA: AA. : AA: AA: AA: 03, the wireless terminal 14 is BB: BB: BB: BB: BB: 01, the wireless terminal 15 is BB: BB: BB: BB: BB: 02, and the wired terminal 16 is CC: CC: CC. : CC: CC: 01, the wired terminal 17 is CC: CC: CC: CC: CC: 02, and the wired terminal 18 is CC: CC: CC: CC: CC: 03.
[0038]
In the present embodiment, the access point 11 is set as a parent access point, and has therein a correspondence table between the MAC address of the child access point and the MAC address of the wired terminal connected to the child access point. The access point 12 and the access point 13 are set as child access points, and are configured to operate as a station in the infrastructure mode, that is, one wireless terminal. Is characterized in that a wireless packet header is configured based on a MAC address correspondence table set therein. As a result, the access point 11 has a function of connecting the wireless terminals 14 and 15 to the wired LAN 19 and Access point 13, a By communicating with Seth point 12 has the function of a wireless bridge connecting wire LAN19 and wired LAN20 and wired LAN19 wired LAN21 and, respectively.
[0039]
In the present embodiment, the child access point also has a correspondence table between the MAC address of the child access point and the MAC address of the wired terminal connected to the child access point, and based on the correspondence table, the address in the wireless packet header. The difference from the first embodiment is that the area is changed.
[0040]
Next, the operation of the wireless LAN system in FIG. 4 will be described with reference to FIGS. FIG. 5 is a data diagram showing a correspondence table between the MAC address of the child access point and the MAC address of the wired terminal connected to the child access point in the wireless LAN system of FIG. 4, and FIG. FIG. 8 is a data diagram showing two flags, an address area, and a second-layer MAC address in a wireless packet header when a packet is transmitted from a connected wired terminal to a wired terminal connected to another wired LAN. The correspondence table between the MAC address of the child access point and the MAC address of the wired terminal connected to the child access point may be manually set in advance for the access point 11, the access point 12, and the access point 13 by the user. .
[0041]
When the wired terminal 17 transmits a packet to the wired terminal 18, the wired terminal 17 transmits an Ethernet (R) packet in which the MAC address of the wired terminal 18 is entered in the destination MAC address. The access point 12 changes the destination address of the address area in the wireless packet header to the MAC address “AA: AA: AA: AA: AA: 03” of the access point 13 based on the MAC address correspondence table, and changes the source address. Is changed to its own MAC address “AA: AA: AA: AA: AA: 02”, the “To DS” flag is set, and wireless transmission is performed. The access point 11 that has received the wireless packet from the access point 12 understands that the transmission destination is a wireless terminal (here, the access point 13) connected to itself, and replaces the content of the wireless packet header with “From DS”. "A flag is set and transmitted to the access point 13. The access point 13 understands that it is a wireless packet addressed to itself from the contents of the address area of the wireless packet header, receives the wireless packet, removes the wireless packet header, and sends the Ethernet (R) packet to the wired LAN 21. Send. Thus, the wired terminal 18 can receive the packet from the wired terminal 17. The access point 12 sets its own MAC address as the source address when transmitting, as in the first embodiment.
[0042]
In the case where the access point 11 manages a wireless terminal connected to itself and processes a wireless packet addressed to the wireless terminal by the wireless unit firmware, the present embodiment employs a wireless driver unit of the access point 11. The processing can be reduced, and the processing can be accelerated, that is, the data transfer speed can be increased.
[0043]
When a terminal normally performs communication, it broadcasts an ARP packet and associates an IP address with a MAC address in response to the ARP packet. Therefore, using the exchange of the packets, the parent access point automatically extracts the MAC address of the wired terminal connected to the child access point from the packet received from the wireless LAN side, and obtains the MAC address of the child access point and the child access point. By automatically generating a correspondence table with the MAC address of the wired terminal connected to the terminal and automatically transferring the created MAC address correspondence table from the parent access point to the child access point, the user manually operates the MAC address correspondence table. This makes it possible to provide a wireless LAN system that is very easy to use.
[0044]
Furthermore, by managing the automatically generated MAC address correspondence table by timer, if there is no packet related to the wired terminal described in the MAC address correspondence table for a certain period of time, the information of the wired terminal is deleted from the MAC address correspondence table. Then, even if the user moves the wired terminal to another wired LAN, normal communication can always be performed.
[0045]
【The invention's effect】
As described above, the wireless LAN system according to the first aspect of the present invention is a wireless LAN system including a plurality of access points for connecting a wired LAN and a wireless LAN, a wireless terminal, and a wired terminal. One of the plurality of access points is set as a parent access point, the remaining access points other than the parent access point are set as child access points as stations, and the parent access point is set as a child access point. Has a MAC address correspondence table indicating the correspondence between the MAC address of the wireless terminal and the MAC address of the wired terminal connected to the child access point, and the destination MAC address stored in the second layer packet header area of the received packet corresponds to the MAC address. For the MAC address described in the table, the MAC address pair By constructing a predetermined wireless packet header based on the table and transmitting it wirelessly, a wireless packet header is configured using the MAC address correspondence table of the parent access point, and the child access point operates as a station. Since the point only needs to support the infrastructure mode and does not need to operate in the WDS mode, the wireless band can be efficiently used without emitting extra wireless packets, and another access point is used for the wireless bridge. , And a wireless bridge function for connecting access points to each other can be provided.
[0046]
According to the wireless LAN system of the present invention, the parent access point automatically extracts the MAC address of the wired terminal connected to the child access point from the packet received from the wireless LAN, and extracts the MAC address of the child access point and the child address. By automatically generating the correspondence table with the MAC address of the wired terminal connected to the access point, it is not necessary for the user to manually set the MAC address correspondence table, and the MAC address correspondence table can be easily set. An advantageous effect is obtained.
[0047]
According to the wireless LAN system of the third aspect, the wireless LAN system includes a plurality of access points that connect the wired LAN and the wireless LAN, a wireless terminal, and a wired terminal. One access point is set as a parent access point, the remaining access points other than the parent access point are set as child access points as stations, and the parent access point and the child access point are configured with the MAC address of the child access point and It has a MAC address correspondence table indicating the correspondence with the MAC address of the wired terminal connected to the child access point, and the destination MAC address stored in the second layer packet header area of the received packet is described in the MAC address correspondence table. MAC address in case of MAC address The parent access point or the child access point configures a wireless packet header using the MAC address correspondence table of the parent access point by constructing a predetermined wireless packet header based on Only the infrastructure mode needs to be supported, and there is no need to operate in the WDS mode, so the wireless band can be used efficiently without sending out extra wireless packets, and another access point is provided for the wireless bridge This has the advantageous effect of being able to have a function of connecting a wireless terminal to a wired LAN and a function of a wireless bridge for connecting access points to each other without having to do so.
[0048]
According to the wireless LAN system of the fourth aspect, in the wireless LAN system of the third aspect, the parent access point automatically converts the MAC address of the wired terminal connected to the child access point from a packet received from the wireless LAN. It extracts and automatically generates a correspondence table between the MAC address of the child access point and the MAC address of the wired terminal connected to the child access point, communicates with the child access point at a predetermined time, and displays the MAC address correspondence table as a child. The transmission to the access point has an advantageous effect that the user does not need to manually set the MAC address correspondence table, and particularly the child access point can easily set the MAC address correspondence table.
[0049]
According to the wireless LAN system of the fifth aspect, in the wireless LAN system of the second or fourth aspect, the parent access point performs timer management of the MAC address correspondence table and is described in the MAC address correspondence table. If there is no packet related to the wired terminal for a certain period of time, the information of the wired terminal that has no packet for a certain period of time is deleted from the MAC address correspondence table. An advantageous effect is obtained that communication can be performed and a user-friendly system can be constructed.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a wireless LAN system according to a first embodiment of the present invention.
FIG. 2 is a data diagram showing a correspondence table between a MAC address of a child access point set in a parent access point and a MAC address of a wired terminal connected to the child access point in the wireless LAN system;
FIG. 3A shows two flags and an address area in a wireless packet header when a packet is transmitted and received between a wired terminal connected to one wired LAN and a wired terminal connected to the other wired LAN. Diagram showing data and the second layer MAC address
(B) Two flags, an address area, and a second layer in a wireless packet header when transmitting and receiving a packet between a wired terminal connected to one wired LAN and a wired terminal connected to the other wired LAN. Data diagram showing MAC address
FIG. 4 is a block diagram showing a wireless LAN system according to a second embodiment of the present invention.
FIG. 5 is a data diagram showing a correspondence table between a MAC address of a child access point and a MAC address of a wired terminal connected to the child access point in the wireless LAN system of FIG. 4;
FIG. 6 shows two flags, an address area, a second layer MAC address, and the like in a wireless packet header when transmitting a packet from a wired terminal connected to one wired LAN to a wired terminal connected to the other wired LAN. Showing data diagram
FIG. 7 is a data diagram showing a communication mode, two flags corresponding to the communication mode, and the contents of respective address areas.
FIG. 8 is a block diagram showing a conventional wireless LAN system.
[Explanation of symbols]
1, 2, 11, 12, 13 access points
3, 4, 14, 15 wireless terminals
5, 6, 16, 17, 18 Wired terminal
7, 8, 19, 20, 21 Wired LAN

Claims (5)

A wireless LAN system having a plurality of access points for connecting a wired LAN and a wireless LAN, a wireless terminal, and a wired terminal,
Setting one access point of the plurality of access points as a parent access point, and setting the remaining access points other than the parent access point as child access points as stations;
The parent access point has a MAC address correspondence table indicating a correspondence between a MAC address of the child access point and a MAC address of the wired terminal connected to the child access point, and a second layer packet header area of a received packet. Wherein the destination MAC address stored in the wireless LAN system is a MAC address described in the MAC address correspondence table, a predetermined wireless packet header is constructed based on the MAC address correspondence table, and wireless transmission is performed. . The parent access point automatically extracts the MAC address of the wired terminal connected to the child access point from a packet received from the wireless LAN, and extracts the MAC address of the child access point and the MAC address of the child access point. 2. The wireless LAN system according to claim 1, wherein a correspondence table with a MAC address of the wired terminal is automatically generated. A wireless LAN system having a plurality of access points for connecting a wired LAN and a wireless LAN, a wireless terminal, and a wired terminal,
Setting one access point of the plurality of access points as a parent access point, and setting the remaining access points other than the parent access point as child access points as stations;
The parent access point and the child access point have a MAC address correspondence table indicating a correspondence between the MAC address of the child access point and the MAC address of the wired terminal connected to the child access point, and include a MAC address correspondence table of the received packet. When the destination MAC address stored in the two-layer packet header area is a MAC address described in the MAC address correspondence table, a predetermined wireless packet header is constructed based on the MAC address correspondence table and wirelessly transmitted. Wireless LAN system. The parent access point automatically extracts the MAC address of the wired terminal connected to the child access point from a packet received from the wireless LAN, and extracts the MAC address of the child access point and the MAC address of the child access point. The method according to claim 3, wherein a correspondence table with the MAC address of the wired terminal is automatically generated, and communication with the child access point is performed at a predetermined time, and the MAC address correspondence table is transmitted to the child access point. The wireless LAN system according to the above. The parent access point manages the MAC address correspondence table by a timer, and when there is no packet related to the wired terminal described in the MAC address correspondence table for a fixed time, the information of the wired terminal for which the packet does not exist for a fixed time is used. The wireless LAN system according to claim 2, wherein the wireless LAN system is deleted from the MAC address correspondence table.

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