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The TCP/IP Guide  9  TCP/IP Lower-Layer (Interface, Internet and Transport) Protocols (OSI Layers 2, 3 and 4)       9  TCP/IP Internet Layer (OSI Network Layer) Protocols            9  Internet Control Message Protocol (ICMP/ICMPv4 and ICMPv6)                 9  ICMP Message Types and Formats                      9  ICMP Version 6 (ICMPv6) Error Message Types and Formats

ICMPv6 Time Exceeded Messages 1 2 3 ICMP Version 6 (ICMPv6) Informational Message Types and Formats

ICMPv6 Parameter Problem Message Format

Table 106 and Figure 156 show the format for ICMPv4 Parameter Problem messages:

Table 106: ICMPv6 Parameter Problem Message Format

Field Name	Size (bytes)	Description
Type	1	Type: Identifies the ICMPv6 message type; for Parameter Problem messages this is set to 4.
Code	1	Code: Identifies the general class of the parameter problem. See Table 107 for more information.
Checksum	2	Checksum: 16-bit checksum field for the ICMP header, as described in the topic on the ICMP common message format.
Pointer	4	Pointer: An offset that points to the byte location in the original datagram that caused the Parameter Problem message to be generated. The device receiving the ICMP message can use this value to get an idea of which field in the original message had the problem.
Original Datagram Portion	Variable	Original Datagram Portion: As much of the IPv6 datagram as will fit without causing the size of the ICMPv6 error message (including its own IP header) to exceed the minimum IPv6 maximum transmission unit (MTU) of 1280 bytes.

ICMPv6 Time Exceeded Messages 1 2 3 ICMP Version 6 (ICMPv6) Informational Message Types and Formats

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