Billion BiPAC 7800(N)X(L) User Manual page 221

Client Side: Branch Office
The client user can set up a tunnel connecting to the PPTP server, and can also set the tunnel as
the default route for all outgoing traffic.
Note: users can see the "Default Gateway" item in the bar, and user can check to select the tunnel
as the default gateway (default route) for traffic. If selected, all outgoing traffic will be forwarded to
this tunnel and routed to the next hop.
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