Digi TransPort WR11 - Configure Layer 2 Tunneling Protocol (L2 TP)

Configuring Virtual Private Networking (VPN) Configure Internet Protocol security (IPsec)
Digi TransPort® Routers User Guide
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Configure Layer 2 Tunneling Protocol (L2TP)
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).