IPv6

발표자 : 전지훈

What is IPv6?

an Internet Layer protocol for packet-switched internetworks. 

the "next generation" protocol designed by the IETF to replace the current version Internet Protocol, IP Version 4 ("IPv4").

IETF : Internet Engineering Task Force ( 국제 인터넷 표준화 기구 )

2

Why IPv6?

Most of today's internet uses IPv4, which is more then twenty years old.

There is a growing shortage of IPv4 addresses, which are needed by all new machines added to the Internet.

3

IPv6 Addresses (1/2)

IPv6 increases the IP address size from 32 bits to 128 bits.

2^32( 약 43 억 ) 개 -> 2^128( 약 3.4*10^38) 개

IPv6 Address 3c1a:0000:000b:e200:0000:0000:3078:e207 3c1a:0:b:e200:0:0:3078:e207 3c1a:0:b:e200::3078:e207 3c1a::b:e200::3078:e207

4

IPv6 Addresses (2/2)

IPv4 mapping address

147.46.243.123 -> ::FFFF:147.46.243.123

IPv4 mapping addresses allow a host that support both IPv4 and IPv6 to communicate with a host that supports only IPv4.

5

IPv6 Addresses types (1/2)

Unicast addresses A unicast address identifies a single network interface. The protocol delivers packets sent to a unicast

address to that specific interface.

Anycast addresses An anycast address is assigned to a group of

interfaces, usually belonging to different nodes. A packet sent to an anycast address is delivered to

just one of the member interfaces, typically the “nearest” according to the routing protocol’s choice of distance.

6

IPv6 Addresses types (2/2)

Multicast addresses A multicast address is also assigned to a set of

interfaces that typically belong to different nodes. A packet that is sent to a multicast address is

delivered to all interfaces identified by that address.

7

IPv6 Headers (1/6)

8

Version Traffic Class

Hop Limit

Flow Label

Payload Length Next Header

Source Address

Destination Address

IPv6 Headers (2/6)

9

Version HL

Fragment Offset

Fragment LengthService

Datagram ID FLAG

TTL Protocol Header Checksum

Source Address

Destination Address

Options (if any)

IPv4 Headers

IPv6 Headers (3/6)

No option field Replaced by extension header. Result in a fixed

length, 40-byte IP header.

No header checksum Result in fast processing.

No fragmentation at intermediate nodes Result in fast IP forwarding.

10

IPv6 Headers (4/6)

Version - version 6 (4-bit IP version).

Traffic class - packet priority (8-bits). Priority values subdivide into ranges: traffic where the source provides congestion control and non-congestion control traffic.

Flow label - QoS management (20 bits). Originally created for giving real-time applications special service, but currently unused.

IPv6 Headers (5/6)

Payload length - payload length in bytes (16 bits).

Next header - Specifies the next encapsulated protocol. The values are compatible with those specified for the IPv4 protocol field (8 bits).

Hop limit - replaces the time to live field of IPv4 (8 bits).

Source and destination addresses - 128 bits each.

IPv6 Headers (6/6)

13

Extension Headers Routing Header - source routing

Fragmentation Header - supports fragmentation of IPv6 datagrams.

Authentication Header

Encapsulating Security Payload Header

Benefits

14

Large IP address space Built on the experiences learned from IPv4 Efficient backbone routing Efficient and Extensible IP datagram Address Autoconfiguration Security (IPsec mandatory) Mobility

In the future… (1/2)

15

미국 미 국방부 - 국방정보망을 IPv6 망으로 완전 전환하기 위해

매년 300 억 달러 이상의 IT 인프라를 구축 . 미의회 산하 감사국 - 23 개 연방정부의 IPv6 전환계획

수립을 촉구 . 미국 예산관리청 - 연방정부에 IPv6 로의 전환을 권고함과

동시에 망 전환계획 및 응용서비스 모델 수립을 요청 .

EU 산업체 , 공공기관 , 가정의 25% 가 2010 년까지 IPv6 를

사용하도록 하는 목표를 설정 . 공공분야 웹사이트와 전자정부 서비스에서 IPv6 사용추진 .

In the future… (2/2)

일본 민간 분야에서 IPv6 도입을 단계적으로 추진하고 있으며 ,

통신사업자들은 상용서비스를 부분적으로 제공 중 . NTT, KDDI 등에서는 IPv6 접속서비스를 일부 제공하고

있으며 향후 기기간 통신 , IPTV 등 신규서비스에 IPv6 적용을 확대해 나갈 계획 .

한국 2007 년 「차세대 인터넷프로토콜 (IPv6) 이용 활성화 대책」

을 수립 , 2010 년까지 공공기관의 인터넷 장비를 IPv6 로

전환하고 , IPv6 이용자를 1,000 만 명 확보를 목표로 관련 기술 개발 및 제도 개선에 주력하고 있음

Reference

http://www.ipv6.org/

http://www.ietf.org/

http://en.wikipedia.org/wiki/IPv6

http://ko.wikipedia.org/wiki/IPv6

http://www.microsoft.com/korea/technet/network/ipvers6.mspx?pf=true

Any Questions?

Thank you.