History & TimeLine--IPv6

History & TimeLine--IPv6

Introduction The Internet Protocol IPv4 was first developed in the 1970s, and the main protocol standard RFC 791 that governs IPv4 functionality was published in 1981. With the unprecedented expansion of Internet usage in recent years - especially by population dense countries like India and China.

The impending shortage of address space (availability) was recognized by 1992 as a serious limiting factor to the continued usage of the Internet run on IPv4. The following table shows a statistic showing how quickly the address space has been getting consumed over the years after 1981, when IPv4 protocol was published

With admirable foresight, the Internet Engineering Task Force (IETF) initiated as early as in 1994, the design and development of a suite of protocols and standards now known as Internet Protocol Version 6 (IPv6), as a worthy tool to phase out and supplant IPv4 over the coming years. There is an explosion of sorts in the number and range of IP capable devices that are being released in the market and the usage of these by an increasingly tech savvy global population. The new protocol aims to effectively support the ever-expanding Internet usage and functionality, and also address security concerns. IPv6 uses a128-bit address size compared with the 32-bit system used in IPv4 and will allow for as many as 3.4x1038 possible addresses, enough to cover every inhabitant on planet earth several times over. The 128-bit system also provides for multiple levels of hierarchy and flexibility in hierarchical addressing and routing, a feature that is found wanting on the IPv4-based Internet. A brief recap of the major events in the development of the new protocol is given below:   Basic protocol (RFC 2460) published in 1998   Basic socket API (RFC 2553) and DHCPv6 (RFC 3315) published in 2003.   Mobile IPv6 (RFC 3775) published in 2004   Flow label specifications (RFC 3697) added 2004   Address architecture (RFC 4291) stable, minor revision in 2006   Node requirements (RFC 4294) published 2006 Features of IPv6 The massive proliferation of devices, need for newer and more demanding applications on a global level and the increasing role of networks in the way business is conducted are some of the pressing issues the IPv6 protocol seeks to cater to. The following are the features of the IPv6 protocol:   New header format designed to keep header overhead to a minimum - achieved by moving both non-essential fields and optional fields to extension headers that are placed after the IPv6 header. The streamlined IPv6 header is more efficiently processed at intermediate routers.   Large address space - IPv6 has 16-byte source and destination IP addresses. The large address space of IPv6 has been designed to allow for multiple levels of subnetting and address allocation from the Internet backbone to the individual subnets within an organization. Obviates the need for address-conservation techniques such as the deployment of NATs.   Efficient and hierarchical addressing and routing infrastructure- based on the common occurrence of multiple levels of Internet service providers.   Stateless and stateful address configuration both in the absence or presence of a DHCP server. Hosts on a link automatically configure themselves with link-local addresses and communicate without manual configuration.   Built-in security: Compliance with IPSec [10] is mandatory in IPv6, and IPSec is actually a part of the IPv6 protocol. IPv6 provides header extensions that ease the implementation of encryption, authentication, and Virtual Private Networks (VPNs). IPSec functionality is basically identical in IPv6 and IPv4, but one benefit of IPv6 is that IPSec can be utilized along the entire route, from source to destination.   Better support for prioritized delivery thanks to the Flow Label field in the IPv6 header   New protocol for neighboring node interaction- The Neighbor Discovery protocol for IPv6 replaces the broadcast-based Address Resolution Protocol (ARP), ICMPv4 Router Discovery, and ICMPv4 Redirect messages with efficient multicast and unicast Neighbor Discovery messages.   Extensibility- IPv6 can easily be extended for new features by adding extension headers after the IPv6 header. IPv6 thus holds out the promise of achieving end-to-end security, mobile communications, quality of service (QoS), and simplified system management. RFC Links Communication between computers on the Internet is made possible through the exchange of packets of digital information in a system dictated by Internet Protocols. The specifications for standard Internet Protocols are recorded in the form of a Request For Comments (RFC) document. There exist eight higher level protocols above the Internet Protocol, which provide additional functionality to different applications. The nine fundamental Internet protocols are referred to by their own acronyms, and are described by the respective RFC's:   IPv6 has a number of technical features making it feasible to support a range of next-generation network applications and services. It is also equipped with extension headers that will make it easy to integrate future features and services without having to rewrite the protocol. Some of the important standards for specification of these features and functionality are given below: RFC 2460 - Internet Protocol Version 6 (IPv6) Specification. This standard covers the following: 128-bit Addressing: Scalability from 232 potential addresses to 2128 addresses, vastly expanding usable unicast and multicast address space End-to-End Addressing: Reintroduces the end-to-end model to greatly lower the cost and complexity of peer-to-peer communications by eliminating the need for Network Address Translation (NAT) Improved QOS Support: More QOS options with flow labels and extension headers Simplified Header: Improved header structure sSpeeds up packet processing in routers and makes basic IPv6 header more compressible (than IPv4) for low data rate wireless and dial-up connections. Extensible Headers: Allows additional protocol-level information to be added to the basic IPv6 header so IPsec and mobile IPv6 are easily integrated on top of the basic IPv6 protocol Advanced Network Services: Basic Ipv6 features and extension headers can be leveraged to build more powerful network services for mobility, security, QOS, peer-to-peer applications, etc. RFC 2460, 4301, & others Improved security support via IP layer security (IPsec) making it cheaper to deploy VPN-like security for all applications RFC 2461, 2462 & others Autoconfiguration: Improved plug and play support using IPv6 link-local addressing, scoped multicasting & anycast support to automatically self-configure and discover neighbor nodes, routers, and servers RFC 2463 Internet Control Message Protocol for IPv6 (ICMPv6) RFC 4291, 4193 New Address Types: New addressing options for link local, anycast, intra-domain3, and globally unique Internet communications. RFC 3041, 3972 Security Addressing: New security addressing options for randomly generated addresses to protect privacy and cryptographically generated addresses used to sign and authenticate messages. RFC 2460, 3306, 4291 Enhanced Multicast Features: Enhanced local and global multicasting support scoped multicasting, and tremendous expansion of usable multicast address space. RFC 4291 Multi-homing Features: Multiple addresses can be assigned to IPv6 network interfaces. Use of different addresses can be used to differentiate link-local, intra-domain, and global messages. Timeline IPv6 deployment is gaining speed as IPv6 infrastructure is being installed throughout the Internet backbone and the major wide-area networks. Tier-1 Internet backbone networks run by AOL Transit Data Network, AT&T, Global Crossing, Level 3, MCI, NTT (Verio), Sprint Nextel, Qwest, SAVVIS, VSNL-Teleglobe, Telesonera, France Telecom, Telefonica have already tested and deployed using IPv6. The major wide-area R&D networks that have been in operation with IPv6 infrastructure, services, and applications for some time now are: AARNET (in Australia), Abilene (Internet2 - in the US), ERNET (in India), CSTNet2 & CERNET2 (in China), Gigabit European Academic Network (GEANT) (in Europe), JGN2 & WIDE (in Japan), KREONET2 (in Korea), RedCLARA (in Latin America), RUNet & FREEnet (in Russia), and TANET2 & TWAREN (in Taiwan).   Projected IPv6 Timeline Adapted from Source: IPv6 Timeline A pragmatic projection http://www.nanog.org/mtg-0302/ppt/hain.pdf A joint project between Lumeta Inc. and the IPv6 Forum (world-wide consortium of leading Internet vendors, industry subject matter experts, and research & education networks formed with the mission to drive IPv6 deployment) was taken up during 2005 to study IPv6 deployment at the global level. The findings indicate that the IPv6 core is well supported, has proven interoperability, is being deployed in the latest generation of routers and operating systems, and is being extended to the last-mile infrastructure necessary to support complete enterprise transitions. Additional standards for stateful autoconfiguration (DHCPv6), IPsec key exchange (IKEv2), SEcure Neighbor Discovery (SEND), and IPv6 over emerging link layers (802.15, WiMAX, etc) are being tested and deployed in new IT infrastructure. The integration of IPv6 into enterprise applications, network management, and security infrastructure is already in progress by governmental initiatives in Asia and the U.S. The U.S. Government, for one, has issued a mandate that the network backbones of all federal agencies must deploy IPv6 by 2008. As things stand, the IPv6 Forum projects the worldwide Internet penetration to reach 25% by 2010, 35% by 2015 and 50% by 2020. By the year 2010, according to the IPv6 Forum, "IPv6 will become a dominant protocol and the New Internet will become commodity for everyone and everything."

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IPv6 Vs IPv4

What is the difference between IPv6 & IPv4

Migrating to a 128 bit Address  Space

What is Internet Protocol (IP)?

IP (short for Internet Protocol) specifies the technical format of packets and the addressing scheme for computers to communicate over a network. Most networks combine IP with a higher-level protocol called Transmission Control Protocol (TCP), which establishes a virtual connection between a destination and a source.

IP by itself can be compared to the postal system. It allows to address a package and drop it in the system, but there's no direct link between sender and the recipient. TCP/IP, on the other hand, establishes a connection between two hosts so that they can send messages back and forth for a period of time.

Internet Protocol Versions

There are currently two version of Internet Protocol: IPv4 and a new version called IPv6. IPv6 is an evolutionary upgrade to the IP. IPv6 will coexist with the older IPv4 for some time.

What is IPv4 -- Internet Protocol Version 4?

IPv4 (Internet Protocol Version 4) is the fourth revision of the Internet Protocol (IP) used to to identify devices on a network through an addressing system. The Internet Protocol is designed for use in interconnected systems of packet-switched computer communication networks.

IPv4 is the most widely deployed Internet protocol used to connect devices to the Internet. IPv4 uses a 32-bit address scheme allowing for a total of 2^32 addresses (just over 4 billion addresses).  With the growth of the Internet it is expected that the number of unused IPv4 addresses will eventually run out because every device -- including computers, smartphones and game consoles -- that connects to the Internet requires an address.

A new Internet addressing system Internet Protocol version 6 (IPv6) is being deployed to fulfill the need for more Internet addresses.

What is IPv6 -- Internet Protocol Version 6?

IPv6 (Internet Protocol Version 6) is also called IPng (Internet Protocol next generation) and it is the newest version of the Internet Protocol (IP) reviewed in the IETF standards committees to replace the current version of IPv4 (Internet Protocol Version 4). 

IPv6 is the successor to Internet Protocol Version 4 (IPv4). It was designed as an evolutionary upgrade to the Internet Protocol and will, in fact, coexist with the older IPv4 for some time. IPv6 is designed to allow the Internet to grow steadily, both in terms of the number of hosts connected and the total amount of data traffic transmitted.

IPv6 is often referred to as the "next generation" Internet standard and has been under development now since the mid-1990s. IPv6 was born out of concern that the demand for IP addresses would exceed the available supply.

While increasing the pool of addresses is one of the most often-talked about benefit of IPv6, there are other important technological changes in IPv6 that will improve the IP protocol:

- No more NAT (Network Address Translation)
- Auto-configuration
- No more private address collisions
- Better multicast routing
- Simpler header format
- Simplified, more efficient routing
- True quality of service (QoS), also called "flow labeling"
- Built-in authentication and privacy support
- Flexible options and extensions
- Easier administration (say good-bye to DHCP)

The Difference Between IPv6 and IPv4 IP Addresses

An IP address is binary numbers but can be stored as text for human readers.  For example, a 32-bit numeric address (IPv4) is written in decimal as four numbers separated by periods. Each number can be zero to 255. For example, 1.160.10.240 could be an IP address.

IPv6 addresses are 128-bit IP address written in hexadecimal and separated by colons. An example IPv6 address could be written like this: 3ffe:1900:4545:3:200:f8ff:fe21:67cf (see "What does an IPv6 address look like?")

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