Please Whitelist This Site? I know everyone hates ads. But please understand that I am providing premium content for free that takes hundreds of hours of time to research and write. I don't want to go to a pay-only model like some sites, but when more and more people block ads, I end up working for free. And I have a family to support, just like you. :) If you like The TCP/IP Guide, please consider the download version. It's priced very economically and you can read all of it in a convenient format without ads. If you want to use this site for free, I'd be grateful if you could add the site to the whitelist for Adblock. To do so, just open the Adblock menu and select "Disable on tcpipguide.com". Or go to the Tools menu and select "Adblock Plus Preferences...". Then click "Add Filter..." at the bottom, and add this string: "@@||tcpipguide.com^$document". Then just click OK. Thanks for your understanding! Sincerely, Charles Kozierok Author and Publisher, The TCP/IP Guide

NOTE: Using software to mass-download the site degrades the server and is prohibited. If you want to read The TCP/IP Guide offline, please consider licensing it. Thank you.

The TCP/IP Guide  9  TCP/IP Lower-Layer (Interface, Internet and Transport) Protocols (OSI Layers 2, 3 and 4)       9  TCP/IP Internet Layer (OSI Network Layer) Protocols

ICMPv6 Informational Message Options 1 IPv6 ND Overview, History, Motivation and Standards

The new Internet Protocol version 6 (IPv6) represents an evolution of the venerable Internet Protocol. It maintains the same basic operational principles of IPv4, but makes some important modifications, particularly in the area of addressing. In fact, some of the more significant changes in IPv6 are actually not in the IP protocol itself, but in the protocols that support IP. One of the most interesting of these was the creation of an entirely new support protocol for IPv6. It combines several tasks previously performed by other protocols in IPv4, adds some new functions, and makes numerous improvements to the whole package. This new standard is called the IPv6 Neighbor Discovery (ND) protocol.

In this section I describe the new Neighbor Discovery protocol used in IPv6. I begin with an overview of the protocol, discussing its history, the motivation for its creation and the standards that define it. I then describe its operation in general terms, listing the fundamental functions that ND performs, the three groups these functions fit into, and the ICMPv6 message types used to carry them out. I describe the key differences between ND and the way that its functions were carried out in IPv4. I then provide more information on the three functional groups in ND: those that involve discovery of important internetwork information from routers, those that are related to address resolution and neighbor communication between hosts, and finally, router redirection.

ICMPv6 Informational Message Options 1 IPv6 ND Overview, History, Motivation and Standards