Port translation

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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

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