com estas regras efetuei o bloqueio que necessito
#
#
# FORWARD chain
#Regras pra restricao de acesso a ICQ
$IPTABLES -A FORWARD -s 131.107.1.2 -d 205.188.179.233 -j ACCEPT
$IPTABLES -A FORWARD -s 131.107.1.2 -d 64.12.162.57 -j ACCEPT
$IPTABLES -A FORWARD -s 131.107.1.2 -d 205.188.153.97 -j ACCEPT
$IPTABLES -A FORWARD -s 131.107.1.2 -d 205.188.153.100 -j ACCEPT
$IPTABLES -A FORWARD -s 131.107.1.2 -d 205.188.153.101 -j ACCEPT
$IPTABLES -A FORWARD -s 131.107.1.2 -d 205.188.153.102 -j ACCEPT
$IPTABLES -A FORWARD -s 131.107.1.2 -d 205.188.153.103 -j ACCEPT
$IPTABLES -A FORWARD -s 131.107.1.2 -d 205.188.153.98  -j ACCEPT
$IPTABLES -A FORWARD -s 131.107.1.2 -d 205.188.153.99 -j ACCEPT
#
$IPTABLES -A FORWARD -s 131.107.0.0/16 -d 205.188.179.233 -j DROP
$IPTABLES -A FORWARD -s 131.107.0.0/16 -d 64.12.162.57 -j DROP
$IPTABLES -A FORWARD -s 131.107.0.0/16 -d 205.188.153.97 -j DROP
$IPTABLES -A FORWARD -s 131.107.0.0/16 -d 205.188.153.100 -j DROP
$IPTABLES -A FORWARD -s 131.107.0.0/16 -d 205.188.153.101 -j DROP
$IPTABLES -A FORWARD -s 131.107.0.0/16 -d 205.188.153.102 -j DROP
$IPTABLES -A FORWARD -s 131.107.0.0/16 -d 205.188.153.103 -j DROP
$IPTABLES -A FORWARD -s 131.107.0.0/16 -d 205.188.153.98  -j DROP
$IPTABLES -A FORWARD -s 131.107.0.0/16 -d 205.188.153.99 -j DROP
#
#
$IPTABLES -A FORWARD -i $LAN_IFACE -j ACCEPT
$IPTABLES -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT
$IPTABLES -A FORWARD -m limit --limit 3/minute --limit-burst 3 -j LOG
--log-level DEBUG --log-prefix "IPT FORWARD packet died: "
#
#
+----------------------------------------------+
| Marcos Aurelio da Silva - Tecnico em Telecom |
++------------------------+-------------------++
 |  Linux user n. 164652  |  Slackware 8.0    |
 |  UIN: 47802921         |  Kernel 2.4.10    |
 |  S�o Paulo - SP        |  Pine 4.40        |
 +------------------------+-------------------+


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