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Most of the internet sharing software I have seen use IP Masquerading as the method of sharing the connection. If IP masquerading is used, then your internet connection as far as your Linux box is concerned should be transparent. The only thing that should be holding back an irc connect to say a port like 6667 of a host would be a firewall on the win box. The software you have, could be using a filtering or firewalling procedure. A true proxy server, at least as I understand it, sort of caches the internet to avoid having to run a 'ton of similar packets each time from the internet to a bunch of down stream machines. So like you have 10 users down stream and they all use Yahoo as a home page, the Proxy server stores page info in it's cache so it isn't requesting a bunch of the same packets over and over from the internet servers. If a Proxy method is used, your software would be telling you to seek a specific port on your win server. At least that is my understanding of the process. If IP masquerading is used, I'd be looking for a filter in the way. I'm relying on memory here, but there are differences between a PROXY and masquerading.
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