Network Router User Manual

L2TP Overview
303532-A Rev 00
1-15
RADIUS Accounting
The RADIUS server can provide accounting services in addition to its
authentication services. RADIUS accounting is enabled by default on the Bay
Networks LNS.
The RADIUS accounting server calculates billing charges for an L2TP session
between the remote user and the LNS. To determine these charges, the server uses
information that it receives from the LNS, such as the status of each call and the
number of packets sent during the session. Using this data, the server determines
billing charges, which the network administrator can use to manage network costs.
The primary RADIUS accounting server can be the same server as the
authentication server or it can be a different server.
For more information about RADIUS accounting, see Configuring RADIUS.
L2TP IP Interface Addresses
When configuring the Bay Networks LNS, you must configure an IP address for
every slot that has an L2TP interface. This address is referred to as the L2TP IP
interface address. The L2TP IP interface can be any valid IP address.
The L2TP IP interface address is internal to the LNS. When communicating with
the remote user, the LNS associates the user’s IP address, which is assigned by the
RADIUS server, with the L2TP IP interface address that you configured.
The L2TP IP interface address and the RADIUS-assigned IP address do not have
to be in the same subnet.