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| I wrote a LKM (or borrowed heavily on tcpmod.c by Peter Werner) that detects NMAP OS scans (i.e. nmap -O xxx) and reports it to syslog along with other relevant information about the packet. No doubt it is full of errors, could crash your box, and all the other usual warnings. The output looks like this: Sep 13 00:58:44 dragula /bsd: NMAP OS Detection Scan from:192.168.0.111 on em0 Details: srcport:19639 dstport:256 seq:579505424 ack:0 x2:0 off:10 flags:41 win:16 sum:59364 urp:0 size:15360 The module can be found at http://www.linbsd.org/nmapd.c -Ober |