Port translation

[stan]

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 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?
>

 From the man page it looks like you need a colon on the port for DNAT 
(and no IP
as it will stay the same if not specified, just what you want).
iptables -t nat -A PREROUTING  -p tcp --dport 390 -j DNAT 
--to-destination :5432

I haven't tested, but it seems it should work.