Gateway by sub interface on a 2600 -- Port Map -- FW

[bobbyr]

Okay here Goes
I have three linux firewalls doing inbound port mapping for smtp port 25

24.24.24.24 eth0 FW1
192.168.1.2 eth1 FW1

24.24.24.25 eth0 FW2
192.168.1.3 eth1 FW2

24.24.24.26 eth0 FW3
192.168.1.4 eth1 FW3

I have a cisco 2620 terminating 3 frame Legs on one serial interface

192.168.1.1 eth0
192.168.231.1 ser0/0.1
192.168.232.1 ser0/0.2
192.168.233.1 ser0/0.3

I have 3 mail host hanging off those frame legs

192.168.231.50 Mail Host
192.168.232.50 Mail Host
192.168.233.50 Mail Host

If I set the gateway of last resort on the 2620 to any one of the Firewalls eth1, that firewalls inbound works fine but the other 2 will not work?

Gateway of last resort 0.0.0.0 à 192.168.1.2

Please help I must be missing something I suspect the inbound NAT on Linux for port mapping does not strip the source address when forwarding the packets to the hosts. Is there a way to set default gateways by each serial sub interface?

Thanks for your time

 

[jeter]

did you do a trace route, to see where the problem starts?
Maybe you need to add a route. Jeter@LasVegas.com
J.Fisher CCNA