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Ipv6

Postby BlueWater on Sun Sep 25, 2011 8:03 pm

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Internet Protocol version 6 (IPv6) is a version of the Internet Protocol (IP). IPv6 was developed by the Internet Engineering Task Force (IETF) to deal with this long-anticipated IPv4 address exhaustion.published in December 1998.IPv6 is an Internet Layer protocol for packet-switched internetworking and provides end-to-end datagram transmission across multiple IP networks.

IPv6 uses 128-bit addresses, so the new address space supports 2^128 (approximately 340 undecillion or 3.4×10^38) addresses.IPv6 also implements additional features not present in IPv4. It simplifies aspects of address assignment (stateless address autoconfiguration), network renumbering and router announcements when changing Internet connectivity providers.

IPv6 is supported on all major operating systems in use in commercial, business, and home consumer environments,IPv6 specifies a new packet format, designed to minimize packet header processing by routers.IPv6 is a conservative extension of IPv4. Most transport and application-layer protocols need little or no change to operate over IPv6.

The length of an IPv6 address is 128 bits, compared to 32 bits in IPv4. The address space therefore supports 2^128 or approximately 3.4×10^38 addresses. this amounts to approximately 5×10^28 addresses for each of the 6.8 billion people alive in 2010.
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Last edited by BlueWater on Sun Sep 25, 2011 10:18 pm, edited 1 time in total.
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Compared with IPv4

Postby BlueWater on Sun Sep 25, 2011 9:41 pm

For the next few years (or decades?) there will be a transition period when both IPv4 and IPv6 will be used on the Internet. Ipv6 is growing rapidly, and soon, some users will only have IPv6 addresses. now is the time to begin implementing IPv6 on their website servers.

IPv6 replaces the familiar IPv4 packet header with a completely new header,In addition,IPv6 and IPv4 are not forward/backward compatible, and require different software procedures to handle them.Fortunately, both IPv4 and IPv6 can work over the same physical layer, so existing Ethernet infrastructure can be used, and the MAC addressing scheme remains unchanged.

IPv4's fragmentation feature which is used to break up long packets into shorter ones for some types of physical network, has been heavily modified. In its place, IPv6 connections are supposed to figure out the maximum packet size of the end-to-end connection before using sending packets.

The TTL (Time to Live) field in IPv4 is used to limit the amount of time an IP packet can live on the network;In IPv6, this same function is performed by the Hop Lim (Hop Limit) counter. When the Hop Limit field reaches zero, the packet is discarded.

IPv6 is a conservative extension of IPv4.The most important feature of IPv6 is a much larger address space than in IPv4.The length of an IPv6 address is 128 bits, compared to 32 bits in IPv4.
Last edited by BlueWater on Sun Sep 25, 2011 10:10 pm, edited 1 time in total.
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News for Ipv6

Postby BlueWater on Sun Sep 25, 2011 9:59 pm

1.Source:http://networkvirtualization.com/content/web-sites-must-support-ipv6-2012-expert-warns

Corporations and government agencies must IPv6-enable their public-facing Web sites in the next 24 months or risk upsetting a growing number of visitors with lower-grade connectivity.

2.Source:http://networkvirtualization.com/content/hurricane-electrics-ipv6-network-doubles

Hurricane Electric, a Fremont, Calif., ISP, will announce on Monday that its IPv6 network has doubled in size in less than a year -- a sign of how rapidly IPv6 traffic is increasing across the Internet.

3. Source:http://networkvirtualization.com/content/comcast-open-ipv6-business

Comcast made big strides toward transitioning to IPv6 this week by announcing that it was making IPv6 transit available for wholesale customers that connect to the company’s fiber network.
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