Valeu Pessoal....
Tentei todas as dicas apresentadas, mas a unica que deu certo foi a do clis.
# Bloqueando o Messenger
$IPT -A FORWARD -s $IPSOURCE -p tcp --dport 1863 -j REJECT --reject-with tcp-reset
$IPT -t mangle -A PREROUTING -s $IPSOURCE -p tcp --dport 1863 -j DROP
$IPT -t mangle -A PREROUTING -s $IPSOURCE -d 63.208.13.126 -j DROP
$IPT -t mangle -A PREROUTING -s $IPSOURCE -d 64.4.12.200 -j DROP
$IPT -t mangle -A PREROUTING -s $IPSOURCE -d 64.4.12.201 -j DROP
$IPT -t mangle -A PREROUTING -s $IPSOURCE -d 65.54.131.249 -j DROP
$IPT -t mangle -A PREROUTING -s $IPSOURCE -d 65.54.194.118 -j DROP
$IPT -t mangle -A PREROUTING -s $IPSOURCE -d 65.54.211.61 -j DROP
$IPT -t mangle -A PREROUTING -s $IPSOURCE -d 207.46.104.20 -j DROP
$IPT -t mangle -A PREROUTING -s $IPSOURCE -d 207.46.110.2 -j DROP
$IPT -t mangle -A PREROUTING -s $IPSOURCE -d 204.46.106.162 -j DROP
$IPT -t mangle -A PREROUTING -s $IPSOURCE -d 208.175.188.30 -j DROP
$IPT -t mangle -A PREROUTING -s $IPSOURCE -d 65.54.239.141 -j DROP
$IPT -t mangle -A PREROUTING -s $IPSOURCE -p TCP -m tcp --dport 1863 -j DROP
$IPT -t mangle -A PREROUTING -s $IPSOURCE -d 65.54.179.192 -j DROP
$IPT -t mangle -A PREROUTING -s $IPSOURCE -d 65.54.183.192 -j DROP
$IPT -t mangle -A PREROUTING -s $IPSOURCE -d 207.46.110.252 -j DROP
$IPT -t mangle -A PREROUTING -s $IPSOURCE -d 207.46.107.3 -j DROP
$IPT -t mangle -A PREROUTING -s $IPSOURCE -d 207.46.109.55 -j DROP
$IPT -t mangle -A PREROUTING -s $IPSOURCE -d 207.46.112.65 -j DROP
$IPT -t mangle -A PREROUTING -s $IPSOURCE -d 65.54.239.211 -j DROP
$IPT -t mangle -A PREROUTING -s $IPSOURCE -d 207.46.27.253 -j DROP
$IPT -t mangle -A PREROUTING -s $IPSOURCE -d 207.46.0.0/24 -j DROP
$IPT -t mangle -A PREROUTING -s $IPSOURCE -d 65.54.0.0/24 -j DROP
$IPT -t mangle -A PREROUTING -s $IPSOURCE -p TCP -m tcp --dport 1863 -j DROP
$IPT -t mangle -A PREROUTING -s $IPSOURCE -p TCP -m tcp --dport 7001 -j DROP
$IPT -t mangle -A PREROUTING -s $IPSOURCE -d 65.54.239.211 -j DROP
$IPT -t mangle -A PREROUTING -s $IPSOURCE -d 207.46.27.253 -j DROP
$IPT -t mangle -A PREROUTING -s $IPSOURCE -p TCP -m tcp --dport 6891:6901
$IPT -t mangle -A PREROUTING -s $IPSOURCE -p TCP -m tcp --dport 5190
$IPT -t mangle -A PREROUTING -s $IPSOURCE -d 207.46.107.3 -j DROP
$IPT -t mangle -A PREROUTING -s $IPSOURCE -p TCP -m tcp --dport 1863:1864 -j DROP
$IPT -t mangle -A PREROUTING -s $IPSOURCE -p TCP -m tcp --dport 6891:6901
$IPT -t mangle -A PREROUTING -s $IPSOURCE -p TCP -m tcp --dport 5190
Onde $IPT = iptables
e $IPSOURCE = ip da maquina a ser bloqueada...
Fiz apenas uma alteração nesta regra para bloquear uma faixa de ip ex. 192.168.0.1-192.168.0.100
E bloqueando tambem o gateway.dll no squid.
Funcionou Perfeitamente.
Obrigado a todos pela Atenção