** And more details from [http://wiki.squid-cache.org/SquidFaq/InterceptionProxy#head-182f30adede2d8daf8569aef5027629ed799b0d4 the Squid FAQ] and [http://wiki.squid-cache.org/SquidFaq/InterceptionProxy#head-935dbe4ef8ea8e21c1e04cc7753a09095c0d8285 here]
** others say you can use DHCP or DNS to forward to the proxy too
** more ipchains rules are listed [http://www.linuxhomenetworking.com/wiki/index.php/Quick_HOWTO_:_Ch32_:_Controlling_Web_Access_with_Squid here], haven't test it yet