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copied!<p>Each platform provides APIs to enumerate the network interfaces, e.g. <a href="http://www.kernel.org/doc/man-pages/online/pages/man3/getifaddrs.3.html" rel="nofollow"><code>getifaddrs</code></a> for many Unixes and <a href="http://msdn.microsoft.com/en-us/library/aa923123.aspx" rel="nofollow"><code>GetAdaptersAddresses</code></a> for Windows. Note on Windows there is a separate numerical space for IPv4 and IPv6 adapters which makes the API call <a href="http://msdn.microsoft.com/en-us/library/bb408409%28v=vs.85%29.aspx" rel="nofollow"><code>if_nametoindex</code></a> quite confusing.</p> <p>You may wish to inspect the methods I employed in OpenPGM for portability, considering Windows doesn't really have useful adapter names:</p> <p><a href="http://code.google.com/p/openpgm/source/browse/trunk/openpgm/pgm/getifaddrs.c" rel="nofollow">http://code.google.com/p/openpgm/source/browse/trunk/openpgm/pgm/getifaddrs.c</a></p> <p><a href="http://code.google.com/p/openpgm/source/browse/trunk/openpgm/pgm/nametoindex.c" rel="nofollow">http://code.google.com/p/openpgm/source/browse/trunk/openpgm/pgm/nametoindex.c</a></p> <p><a href="http://code.google.com/p/openpgm/source/browse/trunk/openpgm/pgm/indextoaddr.c" rel="nofollow">http://code.google.com/p/openpgm/source/browse/trunk/openpgm/pgm/indextoaddr.c</a></p> <p><a href="http://code.google.com/p/openpgm/source/browse/trunk/openpgm/pgm/indextoname.c" rel="nofollow">http://code.google.com/p/openpgm/source/browse/trunk/openpgm/pgm/indextoname.c</a></p>

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