ICMPv6

Internet Control Message Protocol version 6 (ICMPv6) maintains and improves on features from ICMP for IPv4.

ICMPv6 reports the delivery of forwarding errors.

For example:
ICMPv6 also delivers information messages such as ping, otherwise known as
Important

Important

By providing a framework for informational messages, ICMPv6 plays an important role in IPv6 features such as

  • Neighbor discovery (ND)

  • Path MTU discovery

  • Multicast Listener Discovery (MLD)

You can identify an IPv6 ICMP packet because the Next Header field in the IPv6 packet header is 58.

Internet Protocol Security (IPsec) with ICMPv6

You can configure IPsec with ICMPv6. For a configuration example of IPsec with ICMPv6, see IPsec with ICMPv6 configuration example.

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