Discussion on Chinese Domain Name technology

including 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

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

Clean 8 bits & UTF-8 problem

Windows Client & Server 之轉碼

IE Browser

Windos OS DNS client

DNS Server

Win 9X Win 2000

ONUTF-8 OFF ON OFF

auto convert to UTF-8

UTF-8

Big-5UTF-8 ^2

UTF8

(default)(default)

Suggestion

Chinese character & Alpha numeric character mixed sub-domain name.

if there exist 8 bits character then that sub-domain character is case sensitive

For example: www.A 王 .tw wWw.A 王 .TW the same

For example: www.a 王 .tw www.A 王 .tw different

Suggestion

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.