Icmp packets to be allow

[Ganesh HariHaran]

Title: Icmp packets to be allow

Hello All

this is urgent for me,

its like this...


am running 2.2.17 kernel and there is huge shell script done by some
person with various variable and parameters called by ipchains. Now i
dont have time to debug.

By default the icmp packet is denied external world.

Now i need to enable few Ips to do a ping to my machine.

I tried few things like this

ipchains -A input -p icmp -s <source network address or op/ netmask>  
-d <network address/network> -j ACCEPT

this doesnt work

Can anyone tell me the chain rule to solve it.
Thanks in Advance
Ganeshh