Data transmission method and equipment

Abstract

The invention discloses a data transmission method and data transmission equipment. The method comprises the following steps that: access controller (AC) equipment judges whether a keep-alive message from access point (AP) equipment is received or not; if the keep-alive message from the access point (AP) equipment is received, the AC equipment determines that a controlling and provisioning of wireless access point (CAPWAP) tunnel is normal and acquires a Session ID corresponding to the AP equipment from the keep-alive message; and the AC equipment maintains the information of the CAPWAP tunnel for the AP equipment according to the session ID. The method and the equipment can adapt to different network address translation (NAT) environments and lighten network maintenance burden.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a data transmission method and equipment. Background technique [0002] WLAN (Wireless Local Area Networks, wireless local area network) provides a wireless connection service of a local area network, which can provide high-speed wireless data access, and has been widely used in various places such as cities, enterprises, buildings, and families. Compared with the traditional wired access method, the wireless local area network allows network users to be more free, completely getting rid of the shackles of cables and port locations, and the wireless local area network makes the terminal easy to carry, easy to move, etc., eliminating or reducing Complicated network wiring, only need to place one or more AP (Access Point, Access Point) devices to establish a local area network covering the entire building or region. [0003] In the current wireless local area networ...

AI Technical Summary

Problems solved by technology

When the public network address or port changes, for the control packet sent by the AP to the AC, since the source IP address and source port of the control packet received by the AC are the public network address and port after NAT conversion, the control The source IP and source port of the message will change. The current AC does not know the change of the AP address, so it cannot update the address information of the AP. The AC will think that it has lost connection with the AP, which will cause the CAPWAP tunnel to go down.

[0022] (2) Does not support NAT device enabling care about peer address and port translation mode

When NAT uses this mode, the NAT device will perform quintuple matching. Since the control tunnel and the data tunnel use different well-known ports (5246 and 5247), when receiving the packets based on the control tunnel and the packets based on the data tunnel , the NAT device will assign different public network ports to the control tunnel and data tunnel, and the current AC creates a data tunnel based on the public network address and port of the control tunnel. The file will be discarded by the NAT device due to quintuple mismatch

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