[Snort-users] Surpress ICMP messages between two internal IP's (pass rule)

Chris Keladis chris at ...6400...
Fri Jul 23 16:45:01 EDT 2004

Hi Bill,

You can use a "suppress" rule on the SIDs that are firing to safely 
ignore these ICMP messages to/from your DCs without disabling the rule 




dogbert at ...11664... wrote:

>Hi All,
>   I doing some more research, it turns out that the offenders are windows 
>domain controllers causing snort to see:
>ICMP Large ICMP Packet <--- used by windows domain controllers to determine the 
>speed of a given link (in this case, the VPN we use).
>ICMP L3retriever Ping
>alerts (logging), what I need to know how to do is to define a pass rule
>for this type of traffic going to and (which are
>the IP address it is tripping on) from 172.21.x.x, is there a good example on 
>this is done)?  (172.21.x.x usually consists of workstation traffic from one 
>office, and 10.1.1.x are servers, as a general rule).
>Does the Snort 2.1 book show good examples of these things, I've been meaning 
>to buy it, but don't know if it would apply with the new 2.2 series being 
>worked on?
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