I have 2 interfaces eth0(192.168.0.1) and eth1(10.1.1.15). And I do nat for all packets in this way.
iptables -t nat -A POSTROUTING -s 192.168.0.0/24 -j MASQUERADE
Now I want to keep source port for natted packets, like this:
192.168.0.1:8080 -> nat -> 10.1.1.15:8080
Is it possible to do this with iptables?