3Com 10014299 Display and Debug L2TP, L2TP Configuration Examples, NAS-originated VPN Networking

Display and Debug L2TP 617

of each VPN connection can be guaranteed. The maximum number of sessions can be configured at either LNS or LAC, and the smaller one is valid.

Perform the following configurations in system view.

Table 685 Configure the Maximum Number of L2TP Sessions

Operation	Command
Configure the maximum number of L2TP	l2tp	session-limit session-number
sessions at local
Restore the maximum number of L2TP	undo	l2tp session-limit
sessions at local to default value

By default, the maximum number of L2TP sessions is 1000.

Given that a certain number of sessions have existed on the router, the system will display the information indicating misconfiguration if the l2tp session-limitcommand is used to configure a session-number smaller than the current one.

Display and Debug L2TP

Use debugging, display command in all views.

Table 686 Display and Debug L2TP

Operation	Command
Display the current L2TP tunnel	display l2tp tunnel
information.
Display the current L2TP session	display l2tp session
information
Enable the debugging of L2TP.	debugging l2tp { all control
	error event hidden payload
	time-stamp }

L2TP Configuration Examples

NAS-originated VPN Networking

I. Networking requirements

A user can access the Intranet of an enterprise through local dial-up access. The NAS authenticates the users to determine whether they are VPN users. The tunnel is used to transmit data between NAS and LNS.

A user can have access to the LAN of a company through dialup. Both the LAC (NAS) and LNS connect to the Internet through serial interfaces, and transmit data through Tunnel. The PC is installed with Windows2000 operation system.

The Async2 interface of LAC and PC are connected to a Modem, and the numbers are 5660046 and 5660040 separately.