NMAP - A Stealth Port Scanner--reference

This scan type requires certain things of the zombie. The IPID sequence generation must be predictable (single-step increments,for example). The host must also have low traffic so that it is unlikely for other packets to hit the zombie whilst Nmap is carrying out its scan (as these will artificially inflate the IPID number!). Cheap routers or MS Windows boxes make good zombie hosts. Most operating systems use randomised sequence numbers (see the OS Fingerprinting section for details on how to check a target’s sequence generation type).

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