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Network Security Snort-Users
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[Snort-users] Tuning sfPortscan

Subject: [Snort-users] Tuning sfPortscan
Date: Mon, 13 Mar 2006 12:00:45 +0000
Hi, one of my sensors is generating a lot of noise from sfPortscan. The alerts are generated correctly (the sensor is monitoring our residential network) mostly by p2p traffic. The problem I have is they're filling my database and causing a performance issue.

What I'd like to do, rather than disable the preprocessor, is see only alerts for scans to hosts on our network. I've added our address range as 'watch_ip' but what I'd like to do is use the equivalent of EXTERNAL_NET from snort.conf for 'ignore_scanned'. Unless I've missed something there isn't an equivalent for sfPortscan?

Rob Ward
University of Liverpool
Computing Services Department


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