Draytek Vigor2920 Series User Manual page 56

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 B
7.
can direct the packets destined to the remote network to Router A via the VPN
connection.
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Vigor2920 Series User's Guide