Multiple webservers on one IP is called virtual hosting, and that's how we do it.
By entering the IP for community without supplying a 'Host: community.novacaster.com' HTTP header, you're not giving the webserver enough info to work out which vhost you're after, so we serve out a default page.
As for the Firefox problem - what's the contents of your /etc/resolv.conf?
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simon
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