Network Router User Manual

Configuring L2TP Services
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Planning Considerations for an L2TP Network
This guide primarily explains how to configure a Bay Networks BLN, BCN, or
ASN router as an LNS in an L2TP network. To successfully operate in an L2TP
network, obtain the following information to configure the LNS.
Tunnel Authentication Passwords
If you plan to enable tunnel authentication, which is optional for the Bay
Networks LNS, you must obtain the LAC password from your ISP. For more
information about the authentication process, see “Tunnel Authentication” on
page 1-12.
RADIUS Server Information
The Bay Networks implementation of L2TP requires that you configure a
RADIUS server to perform user authentication and to assign IP addresses to
remote users.
For the RADIUS server, do the following:
• Configure the RADIUS server with user names and domain names.
• Obtain the address and password of the RADIUS server to enter in the LNS
configuration.
• Configure the RADIUS server to assign IP addresses to remote users.
This address identifies the remote user to the LNS during an L2TP session. If
the remote user does not have a preconfigured address, the only way to assign
addresses is by the RADIUS server. This address is also used for network
communication across the subscriber network.
For more information about configuring Bay Networks routers as RADIUS
servers, see Configuring RADIUS.