Is there any way to stop Ping attacks on the MWG appliance ?! I know the way to stop it for all (Configuration >> Network protection)...but actually I need to stop it for some IP ranges..and allow it for others !
It would not be supported in any way, but you could write some iptables rules to allow/block certain types of ICMP traffic from different sources. There is a decent source of how to do that here. Again, this is not supported in any way, and I would not expect it to last thorugh upgrades, or possibly evne reboots. A much better way would be to make the change on your firewall.