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Dropping ICMP Echo Request
From: Rodrigo Otaviano <rodrigo () otaviano com>
Date: Fri, 14 Nov 2003 13:35:51 -0800

Hi there, 

My goal is to drop some ICMP Echo Request packets in order to minimize
intense ICMP traffic.

I know it's possible to implement some active response on Snort for example
by using it along with FlexResp. For example, if I want to send a message of
"host and port unreachable" to the sender, I can simply use something this:

alert udp any any -> 192.168.1.0/24 31 (resp: icmp_port,icmp_host; msg:
"example";)

But that's not exactly what I want to do.

My question is: is it possible to drop any ICMP Echo Request instead of
sending a new ICMP back ( by using Snort ) or I would have to use some kind
of filter rule manipulation, for example with SnortSam to modify/create an
access control list (acl) on a firewall or router  ?

Rodrigo Otavio Paes de Barros Otaviano

 


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