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But as per my observations, last two DNAT-ed nad SNAT-ed rules are not applied. And my system is sending packets received on 8004 port of eth2 to 192.168.2.162:7000 and sending packets received on 8000 of eth0 to 192.168.1.158:9000.
Mean to say that it is doing totally reverse than what I need.
And as per observation, it is doing symmetric NATing on my packets because it is sending packets received from system A to the destination from which it got packets on port. E.g.
It receives packets on port 8000 of eth1 from system x(192.168.1.158:9000) and sends them from eth2(192.168.253.2:8000) to system A (192.168.253.3:8000).
So it is sending any packets received on port 8000 of eth2 from system A
(192.168.253.3:8000) to system x (192.168.1.158:9000) from where it got packets earlier.
I am using linux 2.6.22 on my board.
How to override this default behavior with my rules?