While it is true that using IP addresses for trust is not good security, it is easy to find out on which IP a connection came in. 
getsockname SOCKET

    Returns the packed sockaddr address of this end
of the SOCKET connection, in case you don't know the
address because you have several different IPs that
the connection might have come in on.

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HTH, --traveler

In reply to Re^4: Discriminating between local and remote IP's by traveler
in thread Discriminating between local and remote IP's by Avitar

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