Method and apparatus for implementing WLAN wireless bridge, and wireless access client terminal

Abstract

The invention discloses a method and a device for realizing wireless bridging of wireless local area networks (WLAN), as well as a wireless access user terminal, applicable to the WLAN framework of a subnet bridged with an access point (AP) through the wireless access user terminal; the wireless access user terminal studies and processes an ARP messages to be forwarded, records the mapping of a source IP address and a source MAC address of the ARP message to a first list, processes a data message based on the result from the study of the ARP message, and replaces the target MAC in a data message with the target IP-corresponding MAC address in the data message in the first list. The invention can realize double-layer wireless bridging, lower the requirements for the functions of wireless network equipment and widen the application range of WLAN.

Description

technical field [0001] The present invention relates to the field of WLAN (Wireless Local Area Network, wireless local area network), in particular to a WLAN wireless bridging implementation method and a WLAN wireless bridging implementation device, and also relates to a wireless access client (wireless Client for short). Background technique [0002] WLAN provides a wireless connection service of a local area network, that is, realizes high-speed data access from a subnet to a local area network (or public network) in a wireless manner. figure 1 An example of WLAN networking is shown: the laboratory subnet is interconnected with the wireless AP (AccessPoint, access point) device of the company's office network through the wireless Client device, so that the subnet (laboratory subnet) can access the local area network wirelessly (Company Office Network). [0003] In order to realize wireless bridging from a subnet to a local area network in a WLAN, the prior art mainly impl...

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Problems solved by technology

[0008] However, the premise of this solution is that the wireless client device needs to support the three-layer routing and forwarding function; its defect is that the support for wireless interconnection needs to be realized by configuring routing or NAT, that is, the IP addresses of subnets and LANs are required to be configured. Unified planning also increases the complexity of networking; especially, for ordinary wireless clients that do not support layer-3 routing and forwarding functions, wireless bridging between subnets and LANs cannot be realized

[0009] From the above analysis, it can be seen that the existing WLAN wireless bridging implementation scheme either requires the AP to additionally support the WDS function, or requires the wireless client to support the layer-3 routing and forwarding function, and it is impossible to realize the secondary connection from the subnet to the LAN through common AP devices and wireless client devices. directly connected to the layer;

[0010] In order to solve this problem, those skilled in the art have carried out many explorations; for example, the Chinese patent application with the application number CN200410006574.6 discloses a method for realizing transparent bridging of wireless LAN bridges, but it needs to carry the center in the message. The tag of the access bridge (equivalent to AP) or remote access bridge (equivalent to wireless client) will change the structure and length of the message, and the processing process is complicated and cumbersome;

[0011] To sum up, in the prior art, there is no wireless access solution from a subnet to a LAN based on the currently commonly used AP and wireless client

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