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Re: [Snort-users] Question on port lists and negation

from [Richard Bejtlich] Network Security [Permanent Link]
Subject: Re: [Snort-users] Question on port lists and negation
Date: Tue, 9 Oct 2007 22:18:25 -0400 
On 10/8/07, John Curry <john.curry@metre.net> wrote:

Hello Richard,

I believe something like the following should work, without the use of 'flow' 
in the rule.

alert tcp any !PORTS -> any !PORTS

The rule needs apply to packets going to and coming from the ports in the 
PORTS list.  I have not found the "->" token to do anything to enforce 
direction since at least 2.4.3.  I've had to rely on the 'flow' option to 
enforce a packet direction for TCP sessions.



Hi John,

Wow, that is an interesting observation regarding -> and 2.4.3.  Can
anyone from Sourcefire confirm this?

Thank you,

Richard

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