<edit>
I've updated what I'm looking to try below, at post 5.
</edit>

Hi all

I'm thinking about installing User Mode Linux on a development server so I can better mimic the environments of all our main servers which run different distros. This dev server has a single external IP pointing at it.

I'm just wondering whether I can use this single IP to access sites on the different environments, or whether I'll have to set up an IP for each environment?

Thanks.

use nat to point for diffrent machine
eg
192.168.0.10:80 <- might use this as default from external XXX.XXX.XXX.XXX
192.168.0.20:800
192.168.0.30:8080

can be done

Would this be done via a router, or could this be done on the UML machine?

In the router have to set with NAT
to point the port forwarding to difrent ip address in the LAN

in the workstation have to set with httpd.conf
one machine run one port for webserver as default
if 3 machine all those must be diffrent port for apache then nat can forward it to respective machine

Thought I'd update what I'm trying to do...

Essentially, I have a dev machine (running debian) which I'm planning to use as a host for UML. It has an direct connection to the internet with an IP, so we can test from different machines and work from outside the office.

What I need to have is 4+ UML instances running on this host machine, each running FC2. They each need to be able to run a web server, and recieve requests from outside/the internet.

The idea was to have each UML instance listening to a different subdomain (a.oursite.com, b.oursite.com, c.oursite.com), and have each web server listening on port 80. We need to access sites (eg: red.a.oursite.com, blue.b.oursite.com, etc) from the internet as well as on our network.

I have pretty much full control over the whole system, so anything's possible.

Any help you can offer would be great!

I've come across this pdf:
http://mia.ece.uic.edu/~papers/publi...ML-1_final.pdf
which outlines how to enable the host to act as a NAT gateway for the UML instances.

Would it be possible, then, to have the host listening on one IP, forwarding all requests for subdomains to their respective UML instances?

i think this one u need to look for

ftp://mirror.pacific.net.au/linux/user-mode-linux