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i have two different ISPs with NAT routers connected to the same subnet that has a Centos6 server with 1 nic at the gateways are GW1 and GW2 any connections coming in on GW1 are connecting fine. any connections coming in on GW2 are not connecting at all. If i change the default gateway on the server to GW2, then connections from GW2 are fine and any from GW1 now no longer work.

i assume packets are being routed back to the default gateway, and being dropped because the NAT is from the other gateway.

how can i setup rules to route incoming connections back via their entry gateway and not use the default route.

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