Comparing ICMPv4 and ICMPv6 Messages

Table 5-3 lists commonly used ICMPv4 messages and their ICMPv6 equivalents listed in order of the ICMPv4 Type and Code fields.

Table 5-3. ICMPv4 Messages and Their ICMPv6 Equivalents

ICMPv4 Message ICMPv6 Equivalent

Destination Unreachable-Network Unreachable (Type 3, Code 0)

Destination Unreachable-No Route to Destination (Type 1, Code 0)

Destination Unreachable-Host Unreachable (Type 3, Code 1)

Destination Unreachable-Address Unreachable (Type 1, Code 3)

Destination Unreachable-Protocol Unreachable (Type 3, Code 2)

Parameter Problem-Unrecognized Next Header Type Encountered (Type 4, Code 1)

Destination Unreachable-Port Unreachable (Type 3, Code 3)

Destination Unreachable-Port Unreachable (Type 1, Code 4)

Destination Unreachable-Fragmentation Needed and DF Set (Type 3, Code 4) (as specified in RFC 1191)

Packet Too Big (Type 2, Code 0)

Destination Unreachable-Communication with Destination Host Administratively Prohibited (Type 3, Code 10)

Destination Unreachable-Communication with Destination Administratively Prohibited (Type 1, Code 1)

Source Quench (Type 4, Code 0)

This message is not present in IPv6.

Redirect (Type 5, Code 0)

Neighbor Discovery Redirect message (Type 137, Code 0). For more information, see Chapter 6, "Neighbor Discovery."

Time Exceeded-TTL Exceeded in Transit (Type 11, Code 0)

Time Exceeded-Hop Limit Exceeded in Transit (Type 3, Code 0)

Time Exceeded-Fragment Reassembly Time Exceeded (Type 11, Code 1)

Time Exceeded-Fragment Reassembly Time Exceeded (Type 3, Code 1)

Parameter Problem (Type 12, Code 0)

Parameter Problem (Type 4, Code 0 or Code 2)

The comparisons between the ICMPv4 Destination Unreachable-Network Unreachable and Destination Unreachable-Host Unreachable messages and their IPv6 equivalents are based on the historical definitions of these messages. In common practice, the ICMPv4 Destination Unreachable-Network Unreachable message is not used because in a classless addressing environment, the network of the destination cannot be determined from the destination address. Instead, the ICMPv4 Destination Unreachable-Host Unreachable message is sent when a route is not found for the destination.



Understanding IPv6
Understanding Ipv6
ISBN: 0735612455
EAN: 2147483647
Year: 2005
Pages: 124
Authors: Joseph Davies

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