This setting specifies the IP address of each WAN connection to be
used for any outgoing traffic originating from the LAN Host.
Note 1: If you do not want to use a specific WAN for outgoing
accesses, you should still choose “default” here, then customize the
outbound access rule in the “Outbound Traffic Management” section.
Note 2: WAN connections in drop-in or IP forwarding mode are not
shown here.