Watchguard Firebox X15 User Manual page 129

About policy-based routing
To send network traffic, a router usually examines the destination address in the packet and looks at the
routing table to find the next-hop destination. In some cases, you want to send traffic to a different path than
the default route specified in the routing table. You can configure a policy with a specific external interface to
use for all outbound traffic that matches that policy. This technique is known as policy-based routing.
If you have an Edge Pro license for your Firebox X Edge and you have configured multi-WAN in round robin
load balancing mode, you can apply policy-based routing to your firewall rules. When you enable policy-
based routing, all traffic for a policy always goes out through the same external interface, even if your multi-
WAN configuration is set to send traffic in a round-robin configuration.
User Guide
Firewall Policies
117