Fw: Problem with iptables -A FORWARD -j DROP

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Hello, I'm installing a bridge-firewall an all is OK, but whe I deny all the 'FORWARD' traffic this rule deny all the traffic included the 'ACCEPT' rules. Mi Kernel is 2.4.18
and i installed itables 1.2.5-3. My script is:
 
iptables -F FORWARD
iptables -F INPUT
iptables -F OUTPUT
 
iptables -A FORWARD -p icmp -s 89.0.0.0/24 -d 89.0.0.55/32 -j ACCEPT
 
iptables -A FORWARD -j DROP
 
 
 
If I quit the las line it's all OK, if I deny 'ping' it's OK, but if I put the last line all ping are deny.
 
Can somebody help me. I'm sorry for mu poor English.
 
Gabriel.

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