IPv6 Essentials

ICMPv6 Message Types and Code Values (Chapter 4, RFC 2463)

Table B-7 lists ICMPv6 message types and their type numbers.

Table B-7. ICMPv6 message type numbers

Type	Name	Reference	Chapter
1 2 3 4	Destination Unreachable Packet Too Big Time Exceeded Parameter Problem	RFC 2463 RFC 2463 RFC 2463 RFC 2463	Chapter 4
128 129	Echo Request Echo Reply	RFC 2463 RFC 2463	Chapter 4
130 131 132	Multicast Listener Query Multicast Listener Report Multicast Listener Done	MC-LIST MC-LIST MC-LIST
133 134 135 136 137	Router Solicitation Router Advertisement Neighbor Solicitation Neighbor Advertisement Redirect Message	RFC 2461 RFC 2461 RFC 2461 RFC 2461 RFC 2461
138 139 140	Router Renumbering ICMP Node Information Query ICMP Node Information Response	Crawford Crawford Crawford

Table B-8 lists the code values of the Destination Unreachable Message (Type 1).

Table B-8. Code values for the Destination Unreachable message (Type 1)

Code	Description
0	No route to destination. This message is generated if a router cannot forward a packet because it does not have a route in its table for a destination network. This can only happen if the router does not have an entry for a default route.
1	Communication with an administratively prohibited destination. This type of message can, for example, be sent by a firewall that cannot forward a packet to a host inside the firewall because of a packet filter, or if a node is configured not to accept unauthenticated echo requests. ...