Snort mailing list archives
Not-ing out ports
From: John Wiltberger <johwiltb () gmail com>
Date: Mon, 13 May 2013 07:01:19 -0400
So I have a question. When dealing with bi-directional signatures (I know, they aren't ideal in the least, but sometimes you can't help who develops your signatures), if you choose to not-out a port (as in !<port number>), does snort run a boolean OR on the traffic (as in 'if source port != <port number OR destination port != <port number>)? Reason is, I have a signature that's header is 'alert tcp any any <> any !25', yet it is still alerting off of traffic over port 25. I'm sorry if these seems confusing, I can't think of a better way of stating this. Any thoughts?
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Current thread:
- Not-ing out ports John Wiltberger (May 13)
- Re: Not-ing out ports Lay, James (May 13)
- Re: Not-ing out ports Jason Wallace (May 13)
- Re: Not-ing out ports James Lay (May 13)
- Re: Not-ing out ports waldo kitty (May 13)
- Re: Not-ing out ports Jason Wallace (May 13)
- Re: Not-ing out ports Lay, James (May 13)