1. IPv4 and IPv6 Interoperability Chap 12

2. IPv6 Objectives  Expanded Addressing Capabilities  Header Format Simplification  Improved Support for Extensions and Options  Flow Labeling Capability  Authentication and Privacy Capabilities

3. IPv6 Features  Features  128-bit addresses (classless)  multicast  real-time service  authentication and security  autoconfiguration  end-to-end fragmentation  protocol extensions  Header  40-byte “base” header  extension headers (fixed order, mostly fixed length)  fragmentation  source routing  authentication and security  other options

4. Terminologies

5. IPv6 Header Format(1) IPv4 Header Format IPv6 Header Format

6. Extension Headers  Extension Header Order  IPv6 header  Hop-by-Hop Options header  Destination Options header  Processing option for node indicated by IPv6 Destination Address & Routing header’s list  Routing header  Fragment header  Authentication header  Encapsulating Security Payload header  Destination Options header  Only by the final destination of the packet  Upper-layer header

7. IPv6 Addressing Model  IPv6 addresses of all types are assigned to interfaces.  All interface are required to have at least one link-local unicast address.  A single interface may also be assigned multiple IPv6 addresses of any type or scope.  Currently IPv6 continues the IPv4 model that a subnet prefix is associated with one link.

8. Text Representation of Address  X:X:X:X:X:X:X:X (X: Hexadecimal) ex) FEDC:BA98:7654:3210:FEDC:BA98:7654:3210  In order to make writing addresses containing zero bits easier a special syntax is available to compress the zeros. ex) 1080:0:0:0:8:800:200C:417A -> 1080::8:800:200C:417A = a unicast addr. FF01:0:0:0:0:0:0:101 -> FF01::101 = a multicast addr. 0:0:0:0:0:0:0:1 -> ::1 = loopback addr. 0:0:0:0:0:0:0:0 -> :: = unspecified addr.  X:X:X:X:X:X:d.d.d.d A mixed environment of IPv4 and IPv6. ex) 0:0:0:0:0:0:13.1.68.3 0:0:0:0:0:FFFF:129.144.52.38

9. Unicast Addresses: Global  Aggregatable Global Addresses  FP : Format Prefix(001)  TLA ID : Top-Level Aggregation ID  RES : Reserved for Future use  NLA ID : Next-Level Aggregation ID  SLA ID : Site-Level Aggregation ID  INTERFACE ID : Interface ID Public Topology Site Topology Interface Topology Network Portion /64 Host Portion ex) 2002:230::/35 -> 001 0000000000010, ETRI TLA 3ffe:2e00::/24 -> 001 1111111111110, 6Bone-KR general global unicast format

10. Unicast Addresses: Link/Site-local  Local-Use IPv6 Unicast Addresses  designed to be used for addressing on a single link for purpose such as auto-address configuration, neighbor discovery, or when no routers are present  Site-Local addresses  designed to be used for addressing inside of a site without the need for a global prefix.

11. Unicast Addresses: etc  IPv6 Address with Embedded IPv4 Addresses  IPv4-compatible IPv6 address  To tunnel IPv6 packets over IPv4 routing infrastructure  IPv4-mapped IPv6 address  To represent IPv4-only addresses.

12. Anycast Addresses  Expected Use  특정한 서비스제공업체들을 통해 전달되도록 하기 위한 중간 주소로 사용가능.  특정 서브넷에 부착된 라우터들의 집합이나 특정 라우팅 도메인으로의 엔트리를 제공하는 라우터들의 집합을 식별하는 용도로 사용가능.  Subnet Anycast Addresses  Packets sent to the Subnet-Router anycast address will be delivered to one router on the subnet.

13. Multicast Addresses  Multicast 주소형식  Flags is a set of 4 Flags  T = 0, 영구 할당 주소용  T = 1, 임시 할당 주소용  Scope is a 4-bit multicast scope value

14. IPv6 address-Testing Macros

15. IPv4 Client, IPv6 Server IPv6 Server on dual stack (Protocol-indep 하게 프로그래밍함이 바람직함 ) Protocol-indep server

16. IPv6 Client, IPv4 Server Processing in Client