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From: Adcock, Matt (Matt.Adcockgsccca.org)
Date: Wed Feb 13 2002 - 17:42:52 CST

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    I think that might be the solution and a very polite way to say RTFM. :-)
    As it turns out after further looking, there is some internal NATting going
    on of which I was not aware. These machines will show false positives when
    you run winmap against the NATted address, but winmap reads properly when
    run against the real address. Thanks for the help.

    Matt

    <snip>
    From the nmap man page:

    UDP scans: This method is used to determine which UDP
              (User Datagram Protocol, RFC 768) ports are open on a
              host. The technique is to send 0 byte udp packets to
              each port on the target machine. If we receive an ICMP
              port unreachable message, then the port is closed.
              Otherwise we assume it is open.

    Therefore, if your hosts are not allowing ICMP in and/or out, you will
    get a false positive. Try scanning the machine(s) for all UDP ports
    ( -p1- is the argument for that on the Unix nmap) and I'll bet you
    get a report showing them all open.

    -Conor
    </snip>

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