
Configuring and Troubleshooting Bay Dial VPN Services
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• 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 home network (see Figure 2-4
) is
a leased line operating with frame relay or PPP (including PPP multilink).
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 8000/5399 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 a summary of how to configure the LNS, see Chapter 8 of this guide. For
complete instructions on how to configure a Bay Networks router as an LNS, see
Configuring L2TP Services.
Tunnel Management in L2TP Tunnels
The Bay Networks tunnel management server (TMS), which resides at the ISP
network, stores the TMS database. This database contains the remote users’
domain name, the IP address information of each LNS, and other tunnel
addressing information that the network administrator configures. The LAC
requests this information from the TMS to construct the L2TP tunnel.
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