I have a Linux box as my firewall/router with 3 NIC's; 1 NIC for LAN and 1 for each Inet connections. I have an internal LAN with 2 routes to the Internet. How do I set up routing to route to a selected Inet connection and somehow sense whether that connection is up and if connection is not up, route to the alternate connection? Inet connections are 56K frame and 4Mbps. I am using the Redhat 5.0 Distribution.