Billion BiPAC 7402(G)X(L) Series User Manual page 130

Example: Configuring a Remote Access L2TP VPN Dial-out Connection
A company's office establishes a L2TP VPN connection with a file server located at a separate location.
The router is installed in the office, connected to a couple of PCs and Servers.
Dial-out
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Chapter 4: Configuration