meu squid :
acl blockedsites url_regex -i "/etc/squid/sites_block.txt"
http_access deny blockedsites
acl msnmessenger url_regex -i gateway.dll
http_access deny msnmessenger
acl HOST_MSN src 172.168.0.0/24
http_access allow redelocal
http_access allow localhost
http_access deny all
meu Firewall:
/sbin/iptables -t nat -A POSTROUTING -o eth1 -j MASQUERADE
# Nessa regra iremos redirecionar todo tráfego da porta 80 da eth0 para a porta 3128 do squid.
/sbin/iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 80 -j REDIRECT --to-port 3128
echo "Carga do Proxy Transparente OK!"
# Nesta Regra Bloqueio do MSN
/sbin/iptables -A FORWARD -s 172.168.0.0 -p tcp --dport 1863 -j REJECT
/sbin/iptables -A FORWARD -s 172.168.0.0 -p udp --dport 54001 -j REJECT
/sbin/iptables -A FORWARD -s 172.168.0.0 -p tcp --dport 8695 -j REJECT
/sbin/iptables -A FORWARD -s 172.168.0.0 -p udp --dport 8724 -j REJECT
/sbin/iptables -A FORWARD -s 172.168.0.0 -p tcp --dport 9474 -j REJECT
/sbin/iptables -A FORWARD -s loginnet.passport.com -j REJECT
/sbin/iptables -A FORWARD -s login.passport.net -j REJECT
/sbin/iptables -A FORWARD -s svcs.microsoft.com -j REJECT
/sbin/iptables -A FORWARD -s gateway.messenger.hotmail.com -j REJECT
/sbin/iptables -A FORWARD -s messenger.hotmail.com -j REJECT
quanto ao site especifico seria o :
www.hotmail.com.br e todo quanto for chat
com este squid por sites ja consegui bloquear : facebook , orkut , etc .... o problema é site citado acima .