From mboxrd@z Thu Jan  1 00:00:00 1970
From: ratheesh k <ratheesh.ksz@gmail.com>
Subject: GRE protocol .
Date: Fri, 30 Apr 2010 12:49:22 +0530
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Router wan interface is eth1 and lan interface is eth0 .

iptables  -A INPUT  -m state --state ESTABLISHED , RELATED  -j ACCEPT .
iptables  -A INPUT  -i eth1 -j DROP .
iptables  -A INPUT  -i eth0 -j ACCEPT

iptables  -A FORWAR -m state  --state ESTABLISHED , RELATED  -j ACCEPT
iptables  -A FORWARD -i eth0 -o eth1 -j ACCEPT
iptables  -A FORWARD -i eth1 -o eth0 -j DROP .

I dont have pptp connection  tracking module installed .  But i can
see GRE protocol packet comed from wan gets routed and reaches my
client machine   connected  to eth0 ?.

I can see message id is 0 in GRE packet .
I have only pptp connection .

Any hint is really appreciated ?

Thanks,
Ratheesh