Avaya Configuring and Troubleshooting Bay Dial VPN (DVS) Networks Uživatelský manuál Strana 33

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Tunneling Overview
303509-A Rev 00 1-13
Providing accounting services for corporate billing
For Layer 3 tunnels, the RADIUS client of this server resides on the gateway.
The RADIUS client on the ISP network generates a RADIUS authentication
request to the appropriate RADIUS server. This request contains the user
authentication information. The CPE receives the authentication request and
forwards it to the RADIUS server.
Once the user is authenticated, the RADIUS server grants access to the remote
node by returning an authentication accept packet with RADIUS authorization
information to the gateway through the CPE.
For a Layer 3 tunnel, the gateway then forwards the user authentication to the
NAS, which initiates an IP tunnel to the gateway using Mobile IP protocol
mechanisms.
For an L2TP tunnel, the RADIUS server database centralizes the authentication
function, eliminating the need to configure each LNS with user names and
passwords. It also assigns an IP address to the remote host to identify the host and
ensure that it is part of its own subnet.
For more information about the Bay Networks implementation of RADIUS user
authentication and accounting, see Configuring RADIUS and the BaySecure
Access Control Administration Guide.
RADIUS Accounting Server
The RADIUS accounting server tracks when users start and end their dial-in
connections and acquires statistics about each session. BaySecure Access
Control™ fully supports RADIUS accounting and provides the network access
server with RADIUS accounting information for every active dial-in session. The
RADIUS accounting server can provide accounting services for the corporate
network, calculating billing charges. For a full description of BaySecure Access
Control and the RADIUS functions it supports, see the BaySecure Access Control
Administration Guide.
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