Multi-Homed Routing

[Thomas Dwyer]

I have a FreeBSD box for hosting as well as a Gateway for a LAN.

I have recently added a 2nd Internet source (for redundancy) and I want to know how to make FreeBSD choose a primary outbound internet source, and chose the other if the primary is down?

Am I correct to assume that FreeBSD will automatically return incoming requests back through the interface that it arrived on?

e.g.
Internet request coming in on interface-A will return via interface-A
and likewise for interface-B

Thanks
Tom