Using the "-O" option with NMAP for OS fingerprinting sends out a series of 7-8 packets. We look for a combination of two of the more unusual ones for a match . We look for TCP packet with the URG, PSH, SYN, FIN flags set and for another TCP packet with no flags set, or a null packet. These are both illegal flag combinations. If we see both of these packets to the same destination port from the same host, we have a pretty high confidence it is a NMAP OS probe.
Actually wouldn't it be better to use the MSS 265 option to identify NMAP ? It is my understanding that you will only really see this with NMAP and that if you actually changed this within NMAP that many of the OS identification signatures would be useless.
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We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...