# Configuring an L2TP LNS

An L2TP network server (LNS) is a node that acts as one side of an L2TP tunnel endpoint and is a peer to the LAC. An LNS is the logical termination point of a PPP connection that is being tunneled from the remote system by the LAC. You can configure your E Series router to function as an LNS.

This chapter includes the following topics that provide information for configuring an L2TP LNS on the E Series router:

- LNS Configuration Prerequisites
- Configuring an LNS
- Creating an L2TP Destination Profile
- Creating an L2TP Host Profile
- Configuring the Maximum Number of LNS Sessions
- Configuring the RADIUS Connect-Info Attribute on the LNS
- Overriding LNS Out-of-Resource Result Codes 4 and 5
- Selecting Service Modules for LNS Sessions Using MLPPP
- Enabling Tunnel Switching
- Creating Persistent Tunnels
- Testing Tunnel Configuration
- Managing L2TP Destinations, Tunnels, and Sessions
- Configuring Disconnect Cause Information
- Configuring the Receive Window Size
- Configuring Peer Resynchronization
- Configuring L2TP Tunnel Switch Profiles
- Configuring the Transmit Connect Speed Calculation Method
- PPP Accounting Statistics
- Stateful Line Module Switchover for LNS Sessions