Method and equipment for releasing IP addresses by DHCP server

Abstract

The invention discloses a method and equipment for releasing IP addresses by a DHCP server. In the method, a wireless access point acquires IP addresses of user terminals by monitoring the process of acquiring the IP addresses from the DHCP server by the user terminals; the wireless access point detects the data flow of the user terminals, and when the wireless access point discovers that one user terminal does not have data flow continuously in the preset time, the wireless access point sends the DHCP Release message of the user terminal to the DHCP server to notify the DHCP server to release the IP address occupied by the user terminal; and the DHCP server receives the DHCP Release message sent from the wireless access point and releases the IP address which is idle at the user terminal and is carried in the message. In the invention, when the user terminal stops using the IP address, the DHCP server is notified in time to release the IP address allocated to the user terminal.

Description

technical field [0001] The invention relates to the communication field, in particular to a method and equipment for a DHCP server to release an IP address. Background technique [0002] At present, the manner in which the wireless user terminal acquires the IP address is usually dynamic acquisition. like figure 1 The shown network application scenario for obtaining a dynamic IP address includes a wireless user terminal, multiple APs connected to the AC, a switch, a router, and a BAS (Broadband Access Server, broadband access server), where the BAS includes a DHCP (Dynamic Host Configuration Protocol, Dynamic Host Configuration Protocol) server is responsible for assigning dynamic IP addresses to user terminals. After the wireless user terminal is turned on, it first receives the radio signal transmitted by the AP (Wireless Access Point, wireless access point). Association relationship, the wireless user terminal exchanges packets with the network side through the AP in t...

AI Technical Summary

Problems solved by technology

[0005] In the prior art, although the IP address resource waste caused by the abnormal shutdown of the user terminal can be alleviated by adjusting the lease time of the IP address (for example, from one day to one hour), for the user terminal that is still in normal use , in order to continue to use the IP address after the lease time of the IP address expires, it is necessary to send a renewal message to the DHCP server before the lease time expires. Therefore, the shortening of the lease time will cause the DHCP server to process a large number of The contract renewal message, thus increasing the burden on the DHCP server, affecting the performance of the DHCP server, and once the contract is renewed in this method, it is still necessary to wait until the IP address lease expires before releasing the idle IP address

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