Nortel Networks manual Bay Networks L2TP Implementation

L2TP Overview

Bay Networks L2TP Implementation

In an L2TP network, the Bay Networks router is the LNS. LNS software operates on the BLN® , BCN® , and ASN™ platforms.

The Bay Networks LNS has the following characteristics:

•Each slot can act as an LNS, which means that one router can have many LNS interfaces, each with its own address. You can have as many LNS interfaces as there are available slots on the router.

•The LNS performs user authentication with a RADIUS server to prevent unauthorized users from accessing the network.

•The LNS accepts only incoming calls; it does not place calls to the LAC.

•The Bay Networks L2TP implementation supports only IP traffic through the L2TP tunnel. The LNS supports only numbered IP addresses.

•The router interface between the ISP and the corporate network (see

Figure 1-1 on page 1-7) is a leased line operating with frame relay, PPP (including PPP multilink), or ATM. Bay Networks recommends that you use a high-speed link, such as T1, for the leased connection.

•The LNS terminates PPP multilink and PPP encapsulated data within an L2TP packet.

•The LNS operates with the LAC implementation configured on the Bay Networks Model 5399 Remote Access Concentrator.

•The host (PC or router) dialing into the ISP network can be on the same subnet as the IP interface on the LNS.

•The LNS supports RIP. RIP is particularly useful when the remote host is a router, because it enables the LNS to learn routing information from the remote router.

For instructions on how to configure a Bay Networks router as an LNS, see Chapter 2, “ Starting L2TP.”

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