| With the advances in wireless communications technology, large-scale deployment ofWireless Local-Area Network has become possible. Traditional WLAN deployment requiresthe administrator to configure access points one by one, as the scale of network grows, its lowefficiency and error-prone defects revealed gradually. Therefore, scholars proposed acentralized WLAN architecture that uses "thin access point" access mode, all the management,configuration and other work was done by the access controller, which reduces deploymentand operational costs, while also provide a centralized management model for operator.In the centralized WLAN architecture, the access controller is the core of the network, itmanagements and controls a large number of thin access points and stations, its performanceis related to the quality of the entire network directly, so the design of access controller isparticularly critical. Access controller uses RadiSys ATCA-7220 packet processing blade asits hardware platform, and adopts ICE to achieve the system's message mechanisms.This paper conducted in-depth research of CAPWAP protocol, and combined with itsmessage transfer mechanism to implement the management of APs successfully, also includesthe configuration of APs and the management of stations. The Paper proposed the concept ofgroup in APs configuration aspect which divided the same configuration of APs into the samegroup, consequently, increased the efficiency of the network administrator's configuration.Used the modification of HTTP packets to achieve the redirection of web page, it supportportal Authentication forcefully. Proposed and implemented three methods of APs discoverAC: L2 broadcast discovery, DHCP and DNS discovery. With the research of the centralizedWLAN architecture authentication technology, concluded to use Portal authentication for userauthentication, and achieve the interaction between AC and Portal server, RADIUS server inauthentication process. |
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