IPv6-The Next Generation ProtocolRAMYA MEKALA

UIN:01008672

What is IPv6

Also known as IPng (next generation)

A new version of the Internet Protocol , which is primarily designed to extend address space.

It is a Network layer protocol used for packet-switched internetworking and provides end-to-end datagram transmission across multiple IP networks.

Difference between IPv4 and IPv6

Expanded address space

Header Format Simplification

IPv6 header is twice as long (40 bytes) as IPv4 header without options (20bytes)

No checksum at the IP network layer

No hop-by-hop segmentation

64 bits aligned

Authentication and Privacy Capabilities

No more broadcast , only Multicasting

Mobility

Privacy

IPv6 packet Header

IPv6 Addressing

Three types

Unicast

Packet delivered to a single interface.

Any cast

Packet delivered to the nearest of a set of interfaces.

Multicast

Packet delivered to all interfaces in a set.

Representation of IPv6 address

IPv6 Addressing Scope

64 bits reserved for the interface ID

16 bits reserved for the end site

16 bits reserved for each service provider

29 bits reserved for all service providers

Migration to IPV6 The current IP-based network will gradually migrate from IPv4 to IPv6.

Signaling interworking will need to be supported between the IPv6 network and the existing IPv4 network.

Mapping of signaling between IPv6 and IPv4 is required.

There are several migration mechanisms from the IPv4 protocol to IPv6 protocol. The following are the most discussed techniques:

-Dual stack:to allow IPv4 and IPv6 to coexist in the same devices and networks.

-Tunneling: to avoid order dependencies when upgrading hosts, routers or regions.

- Translation: to allow IPv6 only devices to communicate with IPv4 only devices.

Dual Stack Technique

In this method it is proposed to implement two protocols stacks in the same device.

The protocol stack used for each link depends on the device used at the other end of the link.

Dual Stack Device

Single Stack Device (IPv6)

Single Stack Device (IPv4)

Dual Stack Device

IPv4/IPv6 Network

Tunnelling Techniques

Translation Techniques

This technique uses a device, the NATPT (Network Address Translation – Protocol Translation) that translates in both directions between IPv4 and IPv6 at the boundary between an IPv4 network and an IPv6 network.

IPv6 NetworkIPv4 Network

NATPTNetwork Address Translation – Protocol Translation

IPv4 IPv6

Benefits of IPv6

Improved efficiency in routing and packet handling .

Support for auto configuration and plug and play.

Support for embedded IPSec .

Enhanced support for Mobile IP and mobile computing devices .

Elimination of the need for network address translation (NAT) .

Support for widely deployed routing protocols .

Aside from the increased address space,IPv6 offers a number of other key design improvements over IPv4.

References

Computer Networking a top down approach 6th edition kurose,Ross.

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

http://

ipv6.com/articles/general/ipv6-the-next-generation-internet.htm

QUERIES ? ? ?