No, the connection tracking takes care of all this. The NAT operations
applied by iptables rules to the first packet creating the connection
are recorded and applied to subsequent packets in the same direction,
while the inverse operations are applied to reply packets in the
opposite direction.
Excellent, it works just fine now! Here's my final iptables file, just
in case it would help anyone in the list:
*filter
:INPUT ACCEPT [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [66:7948]
-A FORWARD -d 10.1.3.133 -i eth0 -o eth1 -p tcp -m tcp --dport 22 -m
state --state NEW -j ACCEPT
-A FORWARD -o eth0 -m state --state NEW,RELATED,ESTABLISHED -j ACCEPT
-A FORWARD -i eth0 -m state --state RELATED,ESTABLISHED -j ACCEPT
COMMIT
*nat
:PREROUTING ACCEPT [451:32699]
:POSTROUTING ACCEPT [2:236]
:OUTPUT ACCEPT [2:236]
-A PREROUTING -d 120.1.1.10 -i eth0 -p tcp -m tcp --dport 2222 -j DNAT
--to-destination 10.1.3.133:22
-A POSTROUTING -s 10.1.3.133 -o eth0 -j SNAT --to-source 120.1.1.10
COMMIT
-A POSTROUTING -o eth1 -p tcp --dport 22 -d 10.1.3.133 -j SNAT --to
10.1.1.50
Thanks again!
-erich
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