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- The Siphon Project is a portable passive network mapping suite. In
- the latest public version, Siphon passively maps TCP ports and
- performs passive operating system detection. Through the magic of
- RFC ambiguity and programmer uniqueness, different machines exhibit
- telltale characteristics that enable Siphon to make a fairly accurate
- guess at what operating system is running on machines sending packets
- out over the wire. The beauty of this method is that our tool does
- not need to send out a slew of non-RFC compliant packets that trip
- intrusion detection systems. In fact, we send out no packets at
- all. Whereas nmap crashes some machines and network hardware when
- performing its active OS detection tests, Siphon would never crash
- remote machines. Siphon is available for UNIX and Win32.
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