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Lets say I have two domains pointing to my IP:

first.com and second.com pointing to 127.0.0.1

When someone connects to first.com:6000 it should go to 127.0.0.1:6000. But when someone connects to second.com:6000 I need it to go to 127.0.0.1:6001.

What's the best way to achieve this? I'm using Ubuntu 10.10.

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Can you please better clarify what you are looking to achieve? Is the communication via http(s) or via some other protocol? Also are the domain names CNAME DNS records to each other or are they unique IP addresses? – Red Tux May 2 '11 at 21:18
There's only one IP address. – user76231 May 2 '11 at 22:37
You're 50% there... there's one other question you forgot to clarify on: Is the communication via http(s) or via some other protocol? – Red Tux May 2 '11 at 23:02
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This is not possible.

The domain name gets resolved to an IP address by the connecting client, and the IP communication to the server just contains a request for the port on the IP address that it resolved to. You will have to change your software configuration to find another solution. You either need to programatically make a different request in the first place or have the answering server do some work in the background or perhaps your API can prompt for the domain as part of your chat with the port.

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Actually, if this is indeed http traffic, a solution could be set up fairly easily using Apache VirtualHosts and mod_proxy. – ErikA May 2 '11 at 21:32
It's not http traffic. – user76231 May 2 '11 at 22:36
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