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.