Hi Evan,
By default, the InterMapper service listens on all interfaces (INADDR_ANY).
However, if you launch intermapperd/InterMapper.exe from the command line, you have access to a set of switches including
--listen <address>
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Listen only on the interface with the specified IPv4 address. Disable IPv6.
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ref: InterMapper User Guide, Reference section, Command-line Options for InterMapper
I tested it, and it applies to the web server as well as to client connections on the InterMapper server process.
best regards,
Mike Maki, InterMapper Support