Re: Surpress ICMP messages between two internal IP's (pass rule)

[Chris Keladis <chris () cmc optus net au>]

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 
alltogether.

http://www.snort.org/docs/snort_manual/node19.html



Regards,

Chris.

dogbert () netnevada net 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
> ICMP PING NMAP
>
> alerts (logging), what I need to know how to do is to define a pass rule
> for this type of traffic going to 10.1.1.21 and 10.1.1.23 (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?
>
> Bill
>
>
>
>
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