This document configures IP addresses, firewall NAT, routing, and firewall mangle rules on a router with 3 interfaces: ether1, ether3, ether4. It sets IP addresses for the interfaces, enables masquerading for ether3 and ether4. Traffic incoming on ether1 is classified and marked to be routed out either ether3 or ether4 interfaces based on destination address. Routing tables are configured to send traffic with specific marks out the corresponding interfaces.