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TCP/IP Guide by Charles M. Kozierok

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TCP/IP Address Resolution for IP Version 6

The TCP/IP ARP is a fairly generic protocol for dynamically resolving network layer addresses into data link layer addresses. Even though it was designed for IPv4, the message format allows for variable-length addresses at both the hardware and network layers. This flexibility means it would have been theoretically possible to use it for the new version of IP, IPv6. Some minor changes might have been required, but the technique could have been about the same.

The designers of IPv6 chose not to do this, however. Changing IP is a big job that has been under way for many years, providing a rare opportunity to change various aspects of TCP/IP. The Internet Engineering Task Force (IETF) decided to take advantage ...

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