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Re: Help with a rule
From: Y M <snort () outlook com>
Date: Tue, 10 Dec 2013 18:53:54 +0000










Hi Tyler,
I don't think you would be able to achieve this through rules. Dependent on the MTU at your network, packet payload 
will be constrained. For example, if the MTU is 1500 and you are looking at a TCP session , then your maximum payload 
will be 1460 excluding IP and TCP headers, given that no IP and TCP options are available in the packet. This is 
different for UDP and ICMP. Not to mention the OS's in use and fragmentation. 
That said, Stream5 preprocessor may help. Specifically, the "max_queued_bytes" and "max_queued_segs". Also, look at the 
Stream5 readme in the Snort tarball (Stream API). I would assume that your Frag3 is also configured for the target OS's 
in use.

ThanksYM
Date: Tue, 10 Dec 2013 12:20:55 -0500
From: tah338 () sr unh edu
To: snort-sigs () lists sourceforge net
Subject: [Snort-sigs] Help with a rule

Hi,

I'm fairly new to Snort, and was wondering if I could get assistance 
with writing a rule. Our Snort system is watching over a private network 
of several secure servers. One of the things we'd like to look for is 
large chunks of data being transferred off any of these servers. I'm 
trying to come up with a rule that alerts us any time there is some 
movement of data over, say, 10MB, but I'm not sure how to go about doing 
this. Any suggestions?

Thanks!

-- 
Tyler MacPherson
Student Operator
UNH Research Computing Center
(603) 862-4518


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------------------------------------------------------------------------------
Rapidly troubleshoot problems before they affect your business. Most IT 
organizations don't have a clear picture of how application performance 
affects their revenue. With AppDynamics, you get 100% visibility into your 
Java,.NET, & PHP application. Start your 15-day FREE TRIAL of AppDynamics Pro!
http://pubads.g.doubleclick.net/gampad/clk?id=84349831&iu=/4140/ostg.clktrk
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Please visit http://blog.snort.org for the latest news about Snort!

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