hazy table rules

Hi,
On a firewall, the rules I am giving are like,

iptables -P INPUT ACCEPT
iptables -P OUTPUT ACCEPT
iptables -P FORWARD DENY

$IPTABLES -t nat -A POSTROUTING -j MASQUERADE

$IPTABLES -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT $IPTABLES -A FORWARD -s 125.125.125.0/24 -p tcp -m tcp --dport 20 -j ACCEPT $IPTABLES -A FORWARD -s 125.125.125.0/24 -p tcp -m tcp --dport 21 -j ACCEPT $IPTABLES -A FORWARD -s 125.125.125.0/24 -p tcp -m tcp --dport 53 -j ACCEPT $IPTABLES -A FORWARD -s 125.125.125.0/24 -p udp -m udp --dport 53 -j ACCEPT $IPTABLES -A FORWARD -p icmp --icmp-type 0 -j ACCEPT
$IPTABLES -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT

Still when I view through iptraf, I find that there is traffic to few outside port 137 of remote machines.

What is the issue?

With warm regards,
-Payal

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