>Anyone knows where can we get some informations to socket for ipv6 (es >function gethostbyname2, struct in6_addr, getaddresinfo,......) Please use: http://www.ietf.org/internet-drafts/draft-ietf-ipngwg-bsd-api-new-06.txt RFC 2133 is OBSOLETE. Does that answer your question? gethostbyname2 is deprecated by the above. There will be a replacement RFC any day now I hope. It is just awaiting a number. /jim