I've got an 1841 connected to 2 ISP, each ISP assigned me a /29. I want to use both connections for inbound SMTP connections to a mail server 10.0.0.1.
Currently connections via ISP1 are working and are showing up correctly under show ip nat translations. But connections made to ISP2 doesn't seems to work unless I'm connection via a different IP in the /29 of ISP2.
I presume that traffic is being routed via the default route (ISP1) and not via the originating interface ISP2.
What configurations options must I enable to allow connections made via ISP2 is routed back via ISP2?