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3Com Router 3000 Ethernet Family
Configuration Guide
2.2.3 Setting Condition Triggering L2TP Tunnel Setup Request and LNS
Address
A router will not send L2TP Tunnel setup request to some other router or LNS server
unless certain conditions are met. By configuring decision making rule based on user
information and specifying IP address of LNS, you may allow the router to determine
whether a user is a VPN user and initiate connection with the LNS. Up to five LNS
addresses can be configured, meaning LNS backup is allowed. In normal operations,
local router (LAC) sends Tunnel setup request to the peer end (LNS) in the order in
which LNS addresses are configured until some LNS accepts the request. This LNS
becomes the peer end of L2TP tunnel.
Perform the following configuration in L2TP group view.
Table 2-3 Set condition triggering L2TP Tunnel setup request and LNS address
Configure to check if the user is VPN
user and set IP address of LNS
Cancel the Tunnel setup request
configuration.
The parameters above have no default values and they can be configured as needed.
But at least one triggering condition must be configured for initiating L2TP Tunnel setup
request.
Note:
When multiple LNSs are configured, since the client PPP connections have different
timeout periods, connections to the IP addresses following the first one (that is,
connections to the redundant LNSs) may not be able to set up. Thus, you are
recommended to configure two LNSs at most.
2.2.4 Setting Tunnel Name
A user can configure local tunnel name on LAC side. The tunnel name of LAC side
must keep in line with the remote name of tunnel configured on LNS side.
These configurations are optional on LAC side.
Perform the following configuration inL2TP group view.
Operation
3Com Corporation
2-8
Chapter 2 Configuration of L2TP
Command
start l2tp { ip ip-addr [ ip ip-addr] [ ip
ip-addr] ... } { domain domain-name |
fullusername user-name }
undo start
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