run ifconfig in the shell and there you'll see your ip. Use th ip you see there to connect to with the same port as the howto say's
Maybe using Squid and Dansguardian and direct all traffic through the webfilter? Can you explain further what you mean by "all" traffic, do you...
Is this machine directly on the internet? If it is then remove network 192.168.0.0 broadcast 192.168.0.255 if not, then something is weird...
Separate names with a comma.