[ubuntu] Internet sharing troubles

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http://ubuntuforums.org – In short, I'm trying to share the Internet connection from a laptop to a converted server Details: AT&T Uverse wireless connection to a decrepit laptop running Ubuntu 10.10 which is connected via ethernet to an old desktop running Ubuntu Server 10.04 The server is intended to be a http server, ssh server, file server, and irc server. Security is a must, so suggestions to bolster security anywhere is appreciated. (HowTos)