Digi TransPort WR11, User Manual

Page: 455 / 866

Configure Virtual Private Networking (VPN) IPsec parameters
Digi TransPort WR Routers User Guide 455
L2TP parameters
The Layer 2 Tunneling Protocol (L2TP) provides a means for terminating a logical PPP connection
on a device other than the one which terminates the physical connection. Typically, both the
physical layer and logical layer PPP connections would be terminated on the same device, for
example, a TransPort router.
With L2TP answering the call, the router terminates the layer 2 connection only and the PPP frames
are passed in an L2TP tunnel to another device which terminates the PPP connection. This device is
sometimes referred to as a Network Access Server (NAS).