Port translation

[Uno Engborg]

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