Discussion on Chinese Domain Name technology including encoding, testing

Discussion on Chinese Domain Name technologyincluding encoding, testing

Clean 8 bits & UTF-8 problem • Escape code “\” rule must be clear. • Ex. 成功成功\ • Other special character in UNIX shell • Ex. 教育(|) • “教育”will be workable

Clean 8 bits & UTF-8 problem • Windows 9X • http://user:account@location@host.domain/ • Ex. http://統一企業 will be error • Automatic insertion “\” in DNS, not insertion “\” in DHCP • Ex. ping 成功\大學 • Windows 2K • UTF-8 in resolver(ping,ftp) • Clean 8 bits in nslookup • Double encoding in IE5 and resolver

Windows Client & Server 之轉碼

Suggestion • Chinese character & Alpha numeric character mixed sub-domain name. • if there exist 8 bits character then that sub-domain character is case sensitive

Suggestion • For example: • www.A王.tw • wWw.A王.TW the same • For example: • www.a王.tw • www.A王.tw different

Multi-lingual • Multi-Byte character & single byte character 的問題 • 多國語言使用multi-byte character

Problem (1) • Multi-byte character has the byte code that is equivalent to single byte ASCII code, and some intermediate processing software package(Ex. BIND, sendmail, web proxy) can not recognize them separately. Especially in control character code (“\”,”@”,”|”…)

Solutions • Solution 1 • Multi-byte character: \nnn\nnn. • Solution 2 • Non ASCII code transformation. UTF-8 • Solution 3 • All character transform to pure ASCII code, UTF-7, UTF-5 • Solution 4 • Clear byte stuffing, Escape code rule “\\”,”\@”

Problem (2) • All alphanumeric domain name is case insensitive, Multi-byte character is case sensitive.

Solutions • Solution 1 • Alphanumeric character transfer to lower(or upper) case first. (client iDNS UTF5) • Solution 2 • All Multi-byte character are transformed to UTF-8, so the multi-byte character will 8th bit set (negative byte) and it will be recognized easily. (win 2K DNS server)

Solutions • Solution 3 • If there exists one multi-byte character in sub-domain name, than that sub-domain will be case sensitive. (BIND server) • For ex. : www.A王.tw “A王”is case sensitive

Why need solution 3 • Clear 8 bits is possible • Leading byte encoding has been used popularly (BIG5, GB, JIS…) • Compression ratio and conversion efficiency ? • An intermediate stage toward UNICODE.

Discussion on Chinese Domain Name technology including encoding, testing