What is ICMPv6, and how does it work?
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Internet Control Message Protocol v6 is the IPv6 version of ICMP. The message types that are familiar from ICMPv4 are still there, but new message types have been defined that reflect the functionality of IPv6, such as Neighbor Discovery, Stateless Address Autoconfiguration, Path MTU Discovery and Multicast Listener Discovery. The message types for Neighbor Discovery and Stateless Address Auto-configuration are Router Solicitation/Advertisement and Neighbor Solicitation/Advertisement.
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This was first published in April 2013