Setting up a server to work from behind a NAT

From Codawiki

In short: forget it.

If you are still reading further and

  1. are familiar with firewalls and IP-masquerading
  2. ready to maintain double NAT-firewalls
  3. have got a NAT with a static external address
  4. need exactly one server behind the NAT

then you have a chance. Ask on the mailing list. I am not going to write the documentation here unless there is a demand.