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Table Of Contents  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

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ICMP Version 6 (ICMPv6) Error Message Types and Formats
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 ICMPv6 Packet Too Big Messages
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ICMPv6 Destination Unreachable Messages
(Page 2 of 3)

ICMPv6 Destination Unreachable Message Format

Table 102 and Figure 152 illustrate the specific format for ICMPv6 Destination Unreachable messages:


Table 102: ICMPv6 Destination Unreachable Message Format

Field Name

Size (bytes)

Description

Type

1

Type: Identifies the ICMPv6 message type; for Destination Unreachable messages this is set to 1.

Code

1

Code: Identifies the “subtype” of unreachable error being communicated. See Table 103 for a full list of codes and what they mean.

Checksum

2

Checksum: 16-bit checksum field for the ICMP header, as described in the topic on the ICMP common message format.

Unused

4

Unused: 4 bytes that are left blank and not used.

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.


Figure 152: ICMPv6 Destination Unreachable Message Format

 

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