Design And Implementation Of JILIN CNC Broadband Radius Server

Users enter internet with PSTN and modem. NAS distributes dynamic IP addresses to users without the site limits so that the users group are enlarged by means of simple and efficient technology. ADSL is a popular mode for broadband alteration to PSTN. It offers 8Mb/s input rate and 1Mb/s output rate and its transfer length ranges from 3km to 5km. ADSL makes signal transferred in high speed through asynchronous transfer and FDM(or Echo Cancellation) to reduce the influence of Cross Talk by separating input signal and output signal. PPPOE protocol is a combination of Ethernet, the best economic LAN technique, and PPP protocol of its expansibility and administrable function. PPPOE inherits the advantages of the high speed of Ethernet and the simpleness, authentication, and distributing IP of PPP dialup, which currently becomes the mainstream access protocol for ADSL. RFC documents standardize the Radius protocol's structure and using. AAA is short for authentication, authorization and accounting, which generally adopts Radius protocol. Radius protocol is broadly used in internet, which provides how user information and accounting information are transferred between NAS and Radius Server, adopting1645 port of UDP protocol.The centralized Radius Server offers radius and management of all dialup and broadband user in JiLin province. The radius operations are shared by different servers through using network switch and L4 switch. The network became safe with fire wall. The corresponding equipments, including radius server, accounting server, database and storage, are chosen considering user number and dialup times. The radius server editing user's name, password and physics site sends band information and access purview to NAS. NAS configures link rate for user and records link time and date packages, which will be sent to radius until user link terminates. The collector process formats records to standard details and send them to accounting process, thus the bills are created. The exception causes related to user terminal line, network equipment or radius should be solved by both sides of user and ISP.The model applications base radius is: VPDN, green network or IPTV. These applications offer new operations and enrich the function of internet.