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Port scanner
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==Assumptions== All forms of port scanning rely on the assumption that the targeted host is compliant with [[Request for Comments|RFC]]. Although this is the case most of the time, there is still a chance a host might send back strange packets or even generate [[False positive#Type I error|false positives]] when the TCP/IP stack of the host is non-RFC-compliant or has been altered. This is especially true for less common scan techniques that are [[Operating system|OS]]-dependent (FIN scanning, for example).<ref name=ERIK77>{{cite book |last1= Erikson |first1= Jon |title=Hacking: The Art of Exploitation |edition=2nd |year= 2008 |publisher=[[No Starch Press]]|location= [[San Francisco]]|isbn=978-1-59327-144-2 |page= 264 }} </ref> The [[TCP/IP stack fingerprinting]] method also relies on these types of different network responses from a specific stimulus to guess the type of the operating system the host is running.
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