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 I would like to know if you could block or ignore ICMP packets. If there is no way to block reception, then is there a way to prevent the kernel from replying? The reason is that I want to prevent other people from abusing the "ping" command and flooding me with ICMP packets. In particular, I want to block only when there is an excessive amount of packets being recieved. (ie. 25+ in a 10 sec period)  | 
ICMP send rate limit / ignoring  by Jukka Santala 
Using ipfwadm  by Charles Barrasso 
Icmp.c and kernal ping replies  by Don Thomas