Switching From IPv4 To IPv6

Published:2011/3/6 21:50:00 Author:LiuQiaoyan From:SeekIC

Internet Protocol version 4 is an Internet Layer protocol for packet-switched internetworking and provides end-to-end datagram transmission across multiple IP networks. It allows 32 bits for an address . It is the first publicly used version of the Internet protocol. By the late 1980s, it became obvious that the address space was not sufficient. Even after the redesign of the addressing system did not solve the problem of address exhaustion. The last block of free IPv4 addresses was assigned in February 2011, though many free ones still remain in most assigned blocks and will continue for some time. It seems indispensable that the Internet infrastructure need further development.

Developed by the Internet Engineering Task Force, the Internet Protocol version 6 is meant to succeed IPv4, which allows for vastly more addresses. This expansion assures more devices and users on the Internet and extra flexibility in allocating IPs. IPv6 owns a new packet format significantly different from IPv4, so the two protocols are interoperable.

Compared with IPv4, the most important feature of IPv6 is that it offers much larger rooms based on a 128 bits value. Although actual space utilization rates will be small routing management and network efficiency will be improved. The next specification of IPv6 is multicast, which designed to transmit a packet to multiple destinations by a single send operation. IPv6 also support new multicast solutions. Thirdly, IPv6 simplifies aspects of stateless address autoconfiguration. If the autocongiguration is unsuitable for an appliance, hosts may be configured in a static manner. Fourthly is the mandatory support for network layer security unlike optional for IPv4.

The process of switching form IPv4 to IPv6 remains tough out of many consideration. The related integrated circuit is KTD718, which is functionally and pin for pin compatible with NCV4264 with a lower quiescent current consumption.

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