Intrusion Detection Systems mailing list archives

Re: RE: detecting a sniffer remotely


From: Laurent.Van-Cauwelaert () epita fr (laurent van-cauwelaert)
Date: Sat, 16 Oct 1999 22:18:11 +0000 (GMT)



Most sniffer detectors based on bug(?) in IP stack implementation, which
makes host, which device(s) is running in promisc. mode recognize IP
packet, even if the mac address in ethernet frame doesn't match.
(otherwise such ethernet frame would get dropped earlier). 

After few test:
It seems that NetBSD 1.4.1 is affected by this "bug".
Linux slackware 4 isn't. 



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