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RE: Port-Knocking vulnerabilities? Jan 21 2008 11:22AM
whip netspace net au
> A server that is behind a default-drop packet filter is not
>_practically_ detectable (say, with an nmap scan). Can you point to a
> piece of software that can reliably perform the timing differences you
> are referring to in order to infer that a server is really listening
> behind such a packet...

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