Draytek Vigor 2820 User Manual page 182

For using IPSec-based service, such as IPSec or L2TP with IPSec Policy, you have to
set general settings in IPSec General Setup, such as the pre-shared key that both
parties have known.
3. Go to LAN-to-LAN. Click on one index number to edit a profile.
4. Set Common Settings as shown below. You should enable both of VPN connections
because any one of the parties may start the VPN connection.
5. Set Dial-Out Settings as shown below to dial to connect to Router B aggressively with
the selected Dial-Out method.
If an IPSec-based service is selected, you should further specify the remote peer IP
Address, IKE Authentication Method and IPSec Security Method for this Dial-Out
connection.
176 Vigor2820 Series User's Guide