Draytek Vigor2710 Series User Manual page 67

If a PPP-based service is selected, you should further specify the remote peer IP
Address, Username, Password, and VJ Compression for this Dial-In connection.
At last, set the remote network IP/subnet in TCP/IP Network Settings so that Router
7.
B can direct the packets destined to the remote network to Router A via the VPN
connection.
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Vigor2710 Series User's Guide