IPv6 Protocols
Not only has the address scheme changed with IPv6, but so have the protocols that exist in the IPv6 protocol suite. ICMPv6 provides a great example.
ICMPv6
The ICMPv6 protocol is responsible for error and status information as in IPv4, but it has been changed. ICMPv6 uses codes, while ICMPv4 used types and codes. For ICMPv6, each code indicates the type of message. Codes from 0 to 127 are used by error messages, while codes 128 to 255 are for information messages. For example, the echo request message is code 128 with ICMPv6, and the echo reply message is code 129.
ICMPv6 has expanded on its features from the ICMPv4 days. You should be familiar with the following two features of the ICMPv6 protocol:
• Multicast Listener ...
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