I have a few public facing interfaces on an ASA and have found that when a connection comes in through an interface that isn't the default route for the ASA, I get an error stating that no route to x.x.x.x from x.x.x.x (interface).
When I add in a static route on the ASA to the destination and route it out over the public interface the traffic came in on, the connections work.
I don't want to go down the road of static routes and know this works on other firewalls.
I have come across "trombone" to force traffic back out the same interface it came in on and would really appreciate some help with this.
I have an ASA 5510 7.2