Internationalized Domain Name Protocol (IDN) & It’s Test Suite in IPv6 Sunyoung Han, Keecheon Kim Dept. of Computer Science and Engineering Konkuk Univ., Seoul, Korea.

Contents  Introduction  Background (Recent works)  IDN Protocol Suite –IPv6 IDN protocol specification which supports ENUM –IDN Test Suite and ENUM Client –International IPv6 IDN Testbed  Conclusion and Future works

Introduction (1/2)  Necessity of Internationalized Domain Name (IDN) –Current Domain Name is restricted with ASCII ’ s subset (a~z, A~Z, 0~9, -) [RFC 1034, 1035] –Requests of IDN are being increased in non-English speaking countries like Korea, China, Japan, Taiwan, etc.  Necessity of ENUM and relation with IDN –Many Internet services and Many Domain Names –Use Telephone No. instead of Domain Names –Convergence of ENUM with DNS –Multilingual in ENUM service

Introduction (2/2)  Requirements of IPv6 on IDN & ENUM –NGN, 3GPP(IMT-2000), 4GPP -> IPv6/All IP –IDN & ENUM are mandatory service in IPv6/All IP –Increasing DNS ’ s importance  Solution –IPv6 + IDN + ENUM –IDN : Protocol specification, Test Suite, Testbed, Client library for application developer –ENUM : ENUM will be supported in IDNS, Client library for application developer

Background (Recent Works) IDN Protocol Mechanism IDNSInternationalized Domain Names System IDNRAInternationalized Host Names Using Resolvers and Applications IDNAInternationalizing Domain Names in Applications Encoding ACE : ASCII Compatible EncodingUTF : Universal Transformation Format Punycode, DUDE, RACE, BRACE, TRACE, SACE UTF-5, UTF-6, UTF-8, UTF-16 iDNS ngDN Kit iDNS mBIND mDNkit idnkit [1998, APNG] IDNS mechanism UTF-5 encoding IDNS/IDNRA/IDNA Many ACE, UTF encoding IETF Proposed Standard 2002 ’ 10 IDNA, Punycode, Nameprep ENUMIPv6 DNS Nameprep A Stringprep Profile for Internationalized Domain Names

IDN Protocol Suite

IDN Protocol Suite Map Cellular Phone PDA IDN Test Suite ENUM Client Computer IP Phone Web server ftp server mail server IDN&ENUM server Gateway Client Other Client PSTN ENUM Query IDN Query IPv4/IPv6 Internet IDN : 건국대. 대학. 한국 ENUM : :220:1017::2 건국대. 대학. 한국 mailto: 건국대. 대학. 한국 sip: 건국대. 대학. 한국 A : Q :

IPv6 DNS Requirements (1/2)  AAAA record –Stores a single IPv6 address –AAAA record is formatted as a fixed-length data  A6 record –Map a domain name to an IPv6 address, with a provision for indirection for leading "prefix" bits –A6 record is formatted as a variable-length data IPv6 Address (16 octets) Prefix len. (1 octet) Address suffix (0..16 octets) Prefix name ( octets)

IPv6 DNS Requirements (2/2)  IP6.INT –Nibble formatted IPv6 reverse mapping domain –Uses PTR record like in-addr.arpa  IP6.ARPA –IPv6 reverse mapping domain –Deprecates references to IP6.INT  DNAME record –Provides alternate naming to an entire subtree of the domain name space –Support renumberable and aggregatable IPv6 addressing

IPv6 IDN Specification  Follow an IDNA mechanism –There ’ s no overhead on server side.  But, Support IDNS mechanism –For not-IDNA and legacy application –If query type is A, AAAA or A6, etc. (not PTR or NAPTR) and include IDN(over 0x80 code) which was not Punycode encoded(no ‘ IESG –’ prefix) then encode it on server side.  Use Punycode Encoding  Support NAPTR record (ENUM)  Fulfill IPv6 DNS Requirements

IDN & ENUM ServerIDN Client Protocol Design ENUM Client Application Name Resolver IDN & ENUM Check ENUM Query Punycode Encoder Name Service (A, AAAA or A6) ENUM Service (NAPTR) ASCII Domain Name Query or PTR Query Internationalized Domain Name Query Punycode Encoder

IDN Test Suite (Design)  IDN Test Suite (Idnslook) –For test IDNA and IDNS mechanism –Support GUI –Support many encoding algorithm Punycode, DUDE, RACE, Encoding-n, UTF-5, UTF-8 –Support many query type A, PTR, MX, TXT, HINFO, CNAME, SOA, etc. –Support multi platform (based on Java) –Modular design Separate GUI, Encoding routine and Resolver More flexible and extensible For support IPv4/IPv6 Dual Stack Now, We ’ re Implementing IPv6 resolver module

IDN Test Suite (Implementation) Encoding type choice Query input Query type choice Name server input Result output Query send button Status display line [Query type choice] [Encoding type choice] [IDN Test Suite – Idnslook]

IDN Test Suite & ENUM Client [IDNS Test Suite][ENUM Client (prototype)]

International IPv6 IDN Testbed

International IDN Testbed APAN-JP vBNS, Abilene CA*Net2, etc SingaREN TEN-155 Local Testbed IDNS Testbed Testbed extension plan IPv6 IDN Root Server Singapore Univ. Interior Testbed KOREN 유럽 GW Network extension plan Dacom ATM XP - Singapore TransPAC XP - Tokyo XP - Seoul

Local IDN Testbed 그림 일부 수정 예정

Virtual Domain Hierarchy 그림 일부 수정 예정

Conclusion and Future works  Conclusion –Necessity of IDN and ENUM –IPv6 IDN & ENUM Server –IDN Test Suite & ENUM Client –International IDN Testbed  Future works –IPv6 IDN & ENUM Server Consider DNSEXT, DNSSEC –Test Suite Support IPv6 Query (AAAA, A6, DNAME, etc.) Support Stability, Reliability test Convergence with ENUM Client –Testbed extension

References  DOMAIN NAMES - CONCEPTS AND FACILITIES [RFC 1034]  DOMAIN NAMES - IMPLEMENTATION AND SPECIFICATION [RFC 1035]  E.164 number and DNS [RFC 2916]  DNS Extensions to support IP version 6 [RFC 1886]  DNS Extensions to Support IPv6 Address Aggregation and Renumbering [RFC 2672]  DNS Extensions to Support IPv6 Address Aggregation and Renumbering [RFC 2874]  Delegation of IP6.ARPA [RFC 3152]  Nameprep: A Stringprep Profile for Internationalized Domain Names [draft-ietf-idn-nameprep-11]  Internationalizing Domain Names in Applications (IDNA) [draft-ietf-idn-idna-14]  Punycode: A Bootstring encoding of Unicode for IDNA [draft-ietf-idn-punycode-03]  Internationalized Domain Names in URIs [draft-ietf-idn-uri-03]  Comparison of AAAA and A6 [draft-ietf-dnsext-aaaa-a6-01 ]  Number Portability in the GSTN: An Overview [draft-ietf-enum-e164-gstn-np-05]  The E.164 to URI DDDS Application (ENUM) [draft-ietf-enum-rfc2916bis-02]  Extensible Provisioning Protocol E.164 Number Mapping [draft-ietf-enum-epp-e164-01]  ENUM Usage Scenarios [draft-ietf-enum-usage-scenarios-00]