Draytek Vigor2820 Series User Manual page 236

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.
7. At last, set the remote network IP/subnet in TCP/IP Network Settings so that Router
A can direct the packets destined to the remote network to Router B via the VPN
connection.
Settings in Router B in the remote office:
1. Go to VPN and Remote Access and select Remote Access Control to enable the
necessary VPN service and click OK.
228 Vigor2820 Series User's Guide