Re: Port translation

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Uno Engborg wrote:
Rüdiger Pretzlaff skrev:

Am 12.07.2008 um 12:21 schrieb Uno Engborg:

For various reasons I would like to forward trafic to port 390 to port 5432 on the same host. One would think this would be a simple task for iptables but I have now tinkered with this for two days, and I still fail to get it right.

I try something like:
echo 1 > /proc/sys/net/ipv4/ip_forward

iptables -t nat -A PREROUTING -p tcp --dport 390 -j REDIRECT --to-ports 5432

I have also tried :
iptables -t nat -A PREROUTING -p tcp --dport 390 -j DNAT --to 192.168.0.5:5432

where 192.168.0.5 is the address of the host


Any ideas on how to do this?

Regards
Uno Engborg

Hi,

add:
iptables -A FORWARD -p tcp --dport 390 -d 192.168.0.5 -j ACCEPT

Thanks., but unfortunately that isn't enough to make it work.

Is there any special kernel modules or /proc/sys/ipv4/* settings I need to do,
or could the problem be that it is the same host?

Regards
Uno Engborg

I don't know how you are applying this so it is hard to say, but you do not need forwarding.

I would prefer to see you use --to-port ( for single port ) rather then using --to-ports

Have you seen this:
http://en.wikipedia.org/wiki/Iptables#Redirection_example

If that does not work, maybe include the output from

iptables -t nat --list

and

iptables -n --list --line-numbers

as there may be something else blocking the packets.




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