IDN is because there isn't a character set for the non-ascii domain names and because some hostname lookup libraries validate their inputs.
rfc952 as modified by rfc1123 define hostnames. hostnames are a subset of domain names. Both fold the case of ascii letters. The DNS is supposed to be case preserving. Most servers don't do this though modern versions of named do. This exposes bugs in DNS clients which try to check the owner names of returned records in a case sensitive manner. Mark -- Mark Andrews, ISC 1 Seymour St., Dundas Valley, NSW 2117, Australia PHONE: +61 2 9871 4742 INTERNET: ma...@isc.org _______________________________________________ DNSOP mailing list DNSOP@ietf.org https://www.ietf.org/mailman/listinfo/dnsop
