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Is it possible? If it is the case, how can I do it? I need it since I want to test communication between web servers on a local network and I do not have a local network. I just have one computer. I use apache on Windows 7.

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Have you considered just using something like VirtualBox or Vmware to setup multiple virtual machines? Virtual machines will give you a more realistic setup, and it will probably be a lot easier to setup. – Zoredache Mar 10 '10 at 9:21
@Zoredache, I actually did not considered this possibility since I did not know about it. Thanks for the advice, I will consider this possibility. – Roman Mar 10 '10 at 9:35
I'm curious about what sort of communication you're trying to test because web sites normally don't talk to each other. Perhaps we can suggest another method. – John Gardeniers Mar 10 '10 at 9:47
@John Gardeniers, web sites talk to each other all the time these days. It is call web-services. – Zoredache Mar 10 '10 at 16:24
@Zoredache, that's a pretty small percentage of sites though, so not the norm. – John Gardeniers Mar 10 '10 at 20:38

Yes, it is possible.

You just have to use two different configuration files which differ (at least) in their Listen directives. Also read Setting which addresses and ports Apache uses.

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