1. IPv4/IPv6, HIP, E.164, URI/URN/URL, DOI Overviews Sep. 7. 2005 Seungjae Lee sjlee@mmlab.snu.ac.kr

2. 2 / 27 Contents IPv4/IPv6 HIP E.164 URI/URN/URL DOI

3. 3 / 27 IPv4 The current Internet Protocol address e.g. 147.46.125.125 RFC 791 (1981) 32bit address: 4,294,967,296 interfaces maximum

4. 4 / 27 The address shortage problem 2 32 addresses is too few Solution  CIDR  Tighter control on the allocation of addresses  Network renumbering  DHCP  NAT  IPv6 (!)

5. 5 / 27 IPv6 RFC 2460 (1998) 128bit address space : 2 128 = 3.4*10 38 e.g. 21DA:00D3:0000:2F3B:00AA:00FF:FE28:9C5A

6. 6 / 27 IPv6 features Larger address space Flexible header format Auto-configuration Support for resource allocation Security Mobility

7. 7 / 27 IPv6 deployments The Internet is still mostly IPv4 Transitional mechanisms  e.g. dual stack, encapsulation

8. 8 / 27 Contents IPv4/IPv6 HIP E.164 URI/URN/URL DOI

9. 9 / 27 The Need for HIP Dual functionalities of current IP address  Topological locator  Network interface identity Limited flexibility  E.g. IP address renumbering, mobility, multi-homing

10. 10 / 27 HIP: Host Identity Protocol Introduce Host Identity (HI) namespace  Decouples the name and locator roles  Public key system New HI layer  Translates Host ID into IP address and vice versa

11. 11 / 27 Pros and Cons of HIP Pros  Solves mobility and multi-homing problem  Security Cons  The IP stack must be modified

12. 12 / 27 Mobility support of HIP

13. 13 / 27 Multi-homing support of HIP

14. 14 / 27 Contents IPv4/IPv6 HIP E.164 URI/URN/URL DOI

15. 15 / 27 E.164 E.164 provides the number structure and functionality for the following three categories of International Public Telecommunication numbers. Geographical Global Networks areas services +800 +82 ITU-T:ITU Telecommunication Standardization Sector http://www.itu.int/ITU-T/

16. 16 / 27 E.164 Number for Geographical areas 1-3 digits (M) N digitsMax (15-M-N) digits CCNDCSN National (significant) number E.164 Number for geographical areas CC : Country Code NDC : National Destination Code SN : Subscriber Number

17. 17 / 27 E.164 and the Internet Internet phone  VoIP, Interworking Gateway E.164 in IPv6 address space (Patent:KT) ENUM

18. 18 / 27 Contents IPv4/IPv6 HIP E.164 URI/URN/URL DOI

19. 19 / 27 URI/URL/URN TermDefinition URI Unique identifier for online resources - Location - Identity URL Locator of online resources URN Unique identifier of online resources URC Metadata for information

20. 20 / 27 URL and URN URL : Uniform Resource Locator  “My copy of the book is on the lightstand in my bedroom.”  scheme://authority/path?query URN : Uniform Resource Name  “I read a neat book; it’s called Pragmatic Programmer.”

21. 21 / 27 URN Syntax urn:nid:nss  nid = Namespace Id  nss = Namespace Specific String Examples  urn:ietf:rfc:3187  urn:isbn:0451450523

22. 22 / 27 URN Resolution URN Converter Web Server URN URC URL resource content

23. 23 / 27 URN Properties Global scope Global uniqueness Persistence Scalability Legacy support Extensibility Independence

24. 24 / 27 Contents IPv4/IPv6 HIP E.164 URI/URN/URL DOI

25. 25 / 27 DOI Digital Object Identifier  Name for an entity on digital networks doi:naming_authority/identifier Almost the same role with the URN

26. 26 / 27 DOI and URN DOI  Managed by International DOI Foundation (IDF)  Fulfills all the functional requirements of URN, but not registered as a formal URN  Internet draft : A spec for DOI as a URI URN  IETF Standard: RFC  Universal Contents Identifier (UCI): based on URN, 2003 NCA( 한국전산원 )

27. 27 / 27 End of Presentation Q / A