Re: event_filter by IP?

["Nicholas Mavis (nmavis)" <nmavis () cisco com>]

William,

Sorry when I responded earlier, I didn’t notice you simply wanted to limit the number of alerts from this rule on that 
single IP. I believe your only options here are to suppress the rule completely for that IP or create two new rules 
based off the original with a detection filter.

Nick

From: William Rehnquyst <rehnquyst () gmail com<mailto:rehnquyst () gmail com>>
Date: Monday, March 24, 2014 at 1:24 PM
To: "snort-users () lists sourceforge net<mailto:snort-users () lists sourceforge net>" <snort-users () lists 
sourceforge net<mailto:snort-users () lists sourceforge net>>
Subject: [Snort-users] event_filter by IP?

Hi,

We have an alert that is generated quite often on one specific host only, and there's isn't anything we can do on the 
host to remediate this as it is a necessary service. It's something we want to keep an eye on but not be overwhelmed by.

Since this is a known issue, we can limit the alert on this host, but we don't want to simultaneously limit this alert 
on other hosts as it can stop us from discovering new issues.

Is there any way I can do the equivalent of event_filter by a specific IP? As far as I know event_filter applies to all 
IPs and I can't specify IP. We don't want to completely suppress it. As far as I know pass rule has no rate limit.

Maybe there's some way to rewrite the rule that I don't know of? So far the only example of rewriting a rule I've seen 
is declaring a variable and then !$ the var, which again acts as a pass rule.

Any ideas? Or is my only recourse suppression?

Appreciated,
Rehn

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