Draytek Vigor 2820 User Manual page 122

Profile Name
Enable this profile
VPN Connection Through Use the drop down menu to choose a proper WAN interface
116
Specify a name for the profile of the LAN-to-LAN
connection.
Check here to activate this profile.
for this profile. This setting is useful for dial-out only.
WAN1 First - While connecting, the router will use WAN1
as the first channel for VPN connection. If WAN1 fails, the
router will use another WAN interface instead.
WAN1 Only - While connecting, the router will use WAN1
as the only channel for VPN connection.
WAN2 First - While connecting, the router will use WAN2
as the first channel for VPN connection. If WAN2 fails, the
router will use another WAN interface instead.
WAN2 Only - While connecting, the router will use WAN2
as the only channel for VPN connection.
Vigor2820 Series User's Guide