No, klaxon does not detect stealth port scanning. I've often thought about
writing a program that does using DLPI/NIT, but haven't actually done it.
It wouldn't be terribly difficult to do..
Courtney purportedly does detect stealth scanning attacks. But then, it's
a lot more functional (and bigger) all around.
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Doug Hughes Engineering Network Services
System/Net Admin Auburn University
Pro is to Con as progress is to congress