Hi,

Because my ISP is blocking every IP port under 1000, I'd like my local nat'ed server to be able to translate incoming and outgoing traffic from some port above 1000 to the default server port locally.

Example :

To connect to my IMAP server (default port : 143) from the outside, I'd connect to my public IP, port 1143 (opened and nat'ed to the right server on my router) and the server would translate this port to 143 on the same machine.

I wish I could simply configure my router to do that but sadly Linksys doesn't permit such setting... I also could modify the listening port of my server but I prefear to keep the default port inside my network.

I think that iptables is the right tool to do that and I never used it and I must say that this tool is not so easy to configure at first sight.

thanks!

Matt

I am not an iptables guru, but this is where I would start:

1 members found this post helpful.

Awesome. It took less than 5 minutes to get the first answer which is WORKING ! So nice.

I love internet :-) I love users that shares their knowledge.

thanks a million.

I am glad I can help, thats what this site is all about and thats why I love it. I have been helped myself plenty of times by the kind strangers here.

Mark this thread solved if you feel your have all your answers.

That's why I try to read and if possible answer some messages each time I ask a question...

Last detail : to be entirely complete, if you want this new rule to survive a reboot, just follow this link : http://www.debian-administration.org/articles/445

Matt

I do not use debian, but in redhat we would use the following one of the following commands to save the firewall rules:

Maybe someone else here who uses debian/ubuntu can pitch in and correct me if I am wrong.