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I currently have a web server running Apache using iptables for a firewall. What I would like to do is setup a new machine with XenServer and install two virtual machines--one running IPCop and one running Linux with Apache. Then I would configure IPCop to have the external IP address and forward port 80 to an internal IP on the second virtual machine. Is this even possible?

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This is possible so long as virtual machine A and B are routable to each other via a private interface through Dom0.

So External -> A -> (A/B internal shared) -> B

Services would need to be listening on the shared internal address and have routes out to A connected networked. If they don't have routing out to A then a port forward would be more applicable on A to B.

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