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TCP/IP Guide by Charles M. Kozierok

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Chapter 35. ICMPV6 INFORMATIONAL MESSAGE TYPES AND FORMATS

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In the previous chapter, we explored a number of Internet Control Message Protocol version 6 (ICMPv6) error messages. These are sent back to the originator of an Internet Protocol version 6 (IPv6) datagram when the originator detects an error it, thereby making it impossible for the error to be delivered. Like the original version of ICMP (ICMPv4), ICMPv6 also defines another message class: informational messages. These ICMPv6 messages are used not to report errors, but to allow the sharing of information required to implement various test, diagnostic, and support functions critical to ...

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