Table of Contents
Advertisement
ICMPv6
ICMP for IPv6 (ICMPv6) combines the roles of ICMP, IGMP and ARP in IPv4. Like IPv4, it provides functions for
reporting delivery and forwarding errors, and provides a simple echo service for troubleshooting. The
implementation of ICMPv6 is based on RFC 4443.
ICMPv6 uses two message types:
•
Error reporting messages indicate when the forwarding or delivery of the packet failed at the destination
or intermediate node. These messages include Destination Unreachable, Packet Too Big, Time
Exceeded and Parameter Problem messages.
•
Informational messages provide diagnostic functions and additional host functions, such as Neighbor
Discovery and Multicast Listener Discovery. These messages also include Echo Request and Echo Reply
messages.
The ping and traceroute commands extend to support IPv6 addresses. These commands use ICMPv6
Type-2 messages.
Path MTU Discovery
IPv6 path maximum transmission unit (MTU), in accordance with RFC 1981, defines the largest packet size
that can traverse a transmission path without suffering fragmentation. Path MTU for IPv6 uses ICMPv6 Type-2
IPv6 Routing
570
Advertisement
Table of Contents
Troubleshooting
