Port Scanning Assumptions
All forms of port scanning rely on the assumption that the targeted host is compliant with RFC 793 - Transmission Control Protocol. Although it is the case most of the time, there is still a chance a host might send back strange packets or even generate 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 OS-dependent (FIN scanning, for example). The TCP/IP stack fingerprinting method also relies on these kind of different network responses from a specific stimulus to guess the type of the operating system the host is running.
Read more about this topic: Port Scanner
Famous quotes containing the words port and/or assumptions:
“When we think back to our forefathers, with their sedentary lives of forest-chopping, railroad-building, fortune-founding, their fox-hunting and Indian taming, their prancing about in the mazurka and the polka, with their coattails flying and their bustles bouncing, to say nothing of their all-day sessions with the port and straight bourbon,... we must realize that we are a nation, not of neurasthenics, but of sissies and slow-motion sports.”
—Robert Benchley (1889–1945)
“Assumptions of male superiority are as widespread and deep rooted and every bit as crippling to the woman as the assumptions of white supremacy are to the Negro.... this is no more a man’s world than it is a white world.”
—Student Non-Violent Coordinating Committee, African American civil rights organization. SNCC Position Paper (Women in the Movement)