[Snort-users] inverse snort rule

Jason Wallace jason.r.wallace at ...11827...
Fri May 22 08:10:39 EDT 2009

I think if you made A, B, C, and D pass rules then configured the
snort alert order so that pass rules are check first, and then had a
rule F that logged everything that might give you what you want.


On Fri, May 22, 2009 at 3:27 AM, yavuz gokirmak <ygokirmak at ...11827...> wrote:
> Hi all,
> I am a new user of snort, I have a question about snort usage.
> I have a file of pcap data ( read vie tcpdump -r)
> Assume we have some rules A,B,C,D and E.
> I want to log unrecognized packets, I mean,
> Packets which matches none of the A,B,C,D,E rules...
> is it possible,
> Can I take the inverse of the whole rule to create new rule like " !A and !B
> and !C and !D and !E" ?
> thanks in advance,
> yavuz...
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