Myra Nelson wrote: > After some more searching, work, and this email from the libc help > list [ http://sourceware.org/ml/libc-help/2011-12/msg00000.html > ] , I've attempted the code from Ulrich Dreppers page at > http://www.akkadia.org/drepper/userapi-ipv6.html . The newer version > of the code (on the right ) which is supposed to be protocol > independent returns getaddrinfo: Servname not supported for > ai_socktype, while the older version ( on the left ) seg faults. Also try another, more practical program (which works here): <url: http://linux-hacks.blogspot.com/2008/04/default-address-selection-part-1.html> (linked from <url:http://www.wtfm.org/ip6to4>) clemens