Sonicwall firewalls are capable of routing specific (HTTP, SMTP etc) traffic thru different internet connections such as FIOS, T1 or Cable Modem. The following instructions are for Sonicwall Firewall administrators that wants to route traffic using another interface.
1. Click on Network
2. Click on Routing
3. Click Add and select the following options as shown below in the screenshot. Your interface will be different as the interface you want to route thru may not be on X2 so select appropriate interfaces.