Need a second web-server but got only one ip-number on the outside.

From: Per Münster (nospam_at_nowhere.com)
Date: 07/25/05 

Date: Mon, 25 Jul 2005 23:05:04 +0200

Hello, I need a second web-server.

I have a domain - e.g. domain.dk Under this domain I run a linux (rh8)
web-server with web-interface for a mail-server.

I have only one ip-number on the outside.

Another web-server (a windows-type) has shown up.

The standard setup is that I on the inside have 3 "public" ip-numbers. These
are by arrangements in the router presentet as one ip-number on the
outside,but via different ports - for Web (80), SMtp (25), [Ftp (21) & Dns
(53) - 21 and 53 together on one ip].

Now another webserver shows up. Will I need one more external ip-number or
can I use the unused smtp-port for e.g. http://www.domain.dk:25 (does not
work). I have allso considerede a subdomain on the form:
second-domanin.domain.dk - or that the Linux-server supports something.

What can I do? And where is it to be done - on the DNS-hotel, at the ISP
or....?

Regards

Per