*nat
:PREROUTING ACCEPT [5:300]
:POSTROUTING ACCEPT [8:674]
:OUTPUT ACCEPT [8:674]
-A PREROUTING -s ! 18.181.0.60 -i eth0 -p tcp -m tcp --dport 10003 -j DNAT --to-destination 18.181.0.60:10003
-A POSTROUTING -d 18.181.0.60 -o eth0 -p tcp -m tcp --dport 10003 -j SNAT --to-source 18.181.0.62
-A PREROUTING -s ! 18.181.0.165 -i eth0 -p tcp -m tcp --dport 10004 -j DNAT --to-destination 18.181.0.165:10003
-A POSTROUTING -d 18.181.0.165 -o eth0 -p tcp -m tcp --dport 10003 -j SNAT --to-source 18.181.0.62
COMMIT

*filter
:INPUT ACCEPT [366:44912]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [292:53151]
-A FORWARD -d 18.181.0.60 -i eth0 -o eth0 -p tcp -m tcp --dport 10003 -j ACCEPT 
-A FORWARD -d 18.181.0.165 -i eth0 -o eth0 -p tcp -m tcp --dport 10003 -j ACCEPT 
COMMIT