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iptables  - port forwarding

Posted on 2004-10-07
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Last Modified: 2011-08-18
Hi there,

I'm running an iptables gateway firewall with 2 interfaces. I had a port forward rule, which forwards any http traffic
hitting the external interface to an internal webserver. I've since added another webserver running on port 8080
and another rule to forward http:8080 traffic.

The first rule work fine but the latter does not?? Can anyone spot a problem.

thanks john

# Forward to webserver 1
$IPTABLES -A FORWARD -i $EXTIF -d $CLIENT \
                     -p tcp --dport 80 -m state --state NEW -j ACCEPT

$IPTABLES -t nat -A PREROUTING -i $EXTIF -p tcp -d XX.XX.XX.XX.\
                   --dport 80 -j DNAT --to-destination 192.168.9.57

$IPTABLES -t nat -A POSTROUTING -o $EXTIF -s $CLIENT \
               -j SNAT --to-source XX.XX.XX.XX.

#Forward to webserver 2
$IPTABLES -A FORWARD -i $EXTIF -d $CLIENT \
                     -p tcp --dport 8080 -m state --state NEW -j ACCEPT

$IPTABLES -t nat -A PREROUTING -i $EXTIF -p tcp -d XX.XX.XX.XX.\
                   --dport 8080 -j DNAT --to-destination 192.168.9.56

$IPTABLES -t nat -A POSTROUTING -o $EXTIF -s $CLIENT \
               -j SNAT --to-source XX.XX.XX.XX.


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Question by:jjbarnsley
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2 Comments
 
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blkline earned 500 total points
ID: 12254332
Do you have a rule further up the chain that precludes the acceptance of 8080?    That's what I'd guess.

If you can't see anything there then post your entire chain (obfuscate the imporant IP addresses first) and let us see the whole thing.

Barry
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by:jjbarnsley
ID: 12254446
thanks barry spotted.
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