Internet Control Message Protocol version 6 (ICMPv6) maintains and improves on features from ICMP for IPv4.
ICMPv6 reports the delivery of forwarding errors.
Destination unreachable
Packet too big (path MTU)
Time exceeded (fragmentation)
Parameter problem
Echo request
Echo reply
Important
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.
You can configure IPsec with ICMPv6. For a configuration example of IPsec with ICMPv6, see IPsec with ICMPv6 configuration example.
ICMP fragmentation distributed denial-of-service (DDoS) attacks flood the destination resources with fragmented packets and overwhelm the network because of massive volumes of traffic. With Fragmented ICMP packet filtering, the system inspects each incoming IPv6 ICMP packet to determine if it should drop the packet or forward it.
Out-of-Band (OOB) management
Circuitless IP (CLIP) management
VLAN management