# Managing L2TP Destinations, Tunnels, and Sessions

When the router is established as an LNS you can manage the destinations, tunnels and sessions.

- Enable the verification of data integrity via UDP.
- Specify the time period for which the router maintains dynamic destinations, tunnels, or sessions after termination.
- Prevent the creation of new sessions, tunnels, and destinations.
- Close and reopen all or selected destinations, tunnels, and sessions.
- Configure drain timeout operations, which control the amount of time a disconnected LAC tunnel waits before restarting after receiving a restart request.
- Configure how many times the router retries a transmission if the initial attempt is unsuccessful.

#### Related Documentation

- Generating UDP Checksums in Packets to L2TP Peers
- Specifying a Destruct Timeout for L2TP Tunnels and Sessions
- Preventing Creation of New Destinations, Tunnels, and Sessions
- Shutting Down Destinations, Tunnels, and Sessions
- Specifying the Number of Retransmission Attempts