3Com Switch 8800 Family IPsec Module Configuration and Command reference Guide

L2TP Configuration Example 123
L2TP Configuration
Example
Network requirements
As shown in Figure 27, a VPN user accesses the headquarter as follows:
■ The L2TP user implements dial-up access.
■ The narrowband access server (NAS) authenticates this user. The NAS sends a
request to the LNS for establishing a Tunnel.
■ After the Tunnel between the NAS and LNS is established, the NAS sends back
the packet about the negotiation with the VPN user to the LNS.
■ The LNS determines whether to receive this connection according to
pre-negotiated content.
■ The user and headquarter communicates through the Tunnel between the NAS
and LNS.
Disable PPP packet debugging undo debugging l2tp dump
Enable L2TP error debugging debugging l2tp error
Disable L2TP error debugging undo debugging l2tp error
Enable L2TP event debugging debugging l2tp event
Disable L2TP event debugging undo debugging l2tp event
Enable hidden AVP debugging debugging l2tp hidden
Disable hidden AVP debugging undo debugging l2tp hidden
Enable L2TP payload debugging debugging l2tp payload
Disable L2TP payload debugging undo debugging l2tp payload
Enable L2TP time stamp debugging debugging l2tp time-stamp
Disable L2TP time stamp debugging undo debugging l2tp timestamp
Table 117 Display and debug L2TP
Operation Command