We had similar configuration & issue when switched from old sisco router to
new fortigate.
Fixed it by a smart support guy totally by chaging routing rules on the
router.

Recheck the routing rules on your setup, don't think you need to dive down
to the kernel.

David



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2012/8/20 Erez D <erez0...@gmail.com>

> hello
>
>
> i have a server with two eth ports, each connects to a different router,
> and then to the internet.
> i want all normal trafic to the internet to go via router 1 (eth0), so i
> added a default route to it
> i want connections TCP coming from all over the internet to the second
> router(eth1), to be accepted.
>
> the problem is that altough connections are coming from eth1, due to the
> default route, they are answered from eth0, which means a tcp connection
> can not be established.
> i know that linux has a conntrack module, can i use it to tell the kernel
> to answer on the same eth it got SYN from ?
>
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>
>
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