Re: Tuning snort rules.

["Ian Macdonald" <secsnort () dirk demon co uk>]

So in this case I would have to remove both the ICMP ping rule and the
speedra rule. Am I right in assuming that there is no way to say Yes this
rule triggered but we are not going to log it and we are not going to
process any other rules that might also trigger.

Thanks

Ian
----- Original Message -----
From: "Williams Jon" <WilliamsJon () johndeere com>
To: "'Ian Macdonald'" <secsnort () dirk demon co uk>;
<snort-users () lists sourceforge net>
Sent: Wednesday, April 24, 2002 10:18 AM
Subject: RE: [Snort-users] Tuning snort rules.


> First, simply changing a rule that has any options, particularly the
content
> option, from alert to pass is a bad idea if you're using the -o flag on
the
> command line.  It forces snort to inspect every packet, and the content
> option means that essentially every byte of every packet has to be
checked,
> so this will slow things down dramatically.  Can you tell I've done this?
> :-)
>
> Second, there is, unfortunately, no easier way to tune the rules than to
sit
> down with the rules, a big mochachino, and your local infrastructure
expert
> and just keep saying "So, do we run Apache? Do we run Speedra? Do we run
> iPlanet? Do we run IPX?" and so on.  Tedious, yes, but its the only way
I've
> found to get rid of all that fluff.  Its part of the reason Marty didn't
> want to include rules in the beginning - no one really knows your network
> better than you, well, except that hacker, but he's not going to help.
>
> Jon
>
> -----Original Message-----
> From: Ian Macdonald [mailto:secsnort () dirk demon co uk]
> Sent: Tuesday, April 23, 2002 4:59 PM
> To: snort-users () lists sourceforge net
> Subject: [Snort-users] Tuning snort rules.
>
>
> What is the best way to tune snort signatures. For example I am seeing
alot
> of speedra pings, from http://www.sans.org/y2k/121100-1200.htm they seem
to
> be an anoyance more than anything else. I originally thought that in order
> to disable a rule I should just comment it out, but that would just mean
> that the later rule for ping would pick it up.
>
> Any suggestions on the best way to do this? What happens if I change the
> rules from alert to pass.
>
> Thanks
>
> Ian
>
>
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