public IP address in order to access the knock port. Check option --resolve for information on how to determine that address automatically.
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<B>-S </B><B></B><I>address</I>, <B>--source-ip </B><B></B><I>address</I> (Set source address)
<DL COMPACT><DT><DD>
This option lets you specify the IP address that is used as the source address for every IP datagram that is sent. It can be specified as a standard IP address or as a hostname.
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<B>-p </B><B></B><I>port</I>, <B>--knock-port </B><B><