Trust check method for discovering access controller

Abstract

The invention provides a trust check method for discovering an access controller, which comprises the following steps: discovering the access controller; sending a unicast discovery request message, wherein the discovery request message carries expanding discovery type message elements; analyzing the expanding discovery type message elements carried by the discovery request message by the access controller to obtain discovery types and an IP address of a presenter; and according to the obtained discovery types, checking and judging the IP address of the presenter and a trust list saved in theaccess controller.

Description

Trust check method for access controller discovery technical field The present invention relates to the Wireless Local Area Network (WLAN) Access Point Control and Provisioning (CAPWAP) protocol, and more particularly, to a trust checking mechanism for Access Controller (AC) discovery. Background technique WLAN provides a wireless connection service of a local area network. Because it can provide high-speed wireless data access, WLAN is a popular wireless access method. WLAN usually adopts a centralized AC-AP (Access Controller-Access Point) architecture. Among them, the AC provides centralized management of the WLAN network, and the AP establishes a link with the AC to join the WLAN network and provides wireless access services. The CAPWAP protocol is a protocol that enables an Access Controller (AC) to manage an Access Point (AP). After the AP is powered on, it needs to find the AC first. That is, before the AP accesses the AC, the AP needs to know the IP address of t...

AI Technical Summary

Problems solved by technology

However, in the current AC discovery mechanism, there is no trust mechanism for DHCP discovery, DNS discovery, and CAPWAP discovery, and trust checks cannot be performed.

In DHCP discovery, the AP obtains the AC address through the DHCP server, but the AC cannot determine whether the DHCP server is legal; in DNS discovery, the AP obtains the AC address through the DNS server, but the AC cannot determine whether the DNS server is legal; similarly, in CAPWAP During discovery, the AP obtains the address of another AC through one AC, but the other AC cannot determine whether the AC is legal.

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