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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) Informational Message Types and Formats

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ICMPv6 Router Renumbering Messages
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 TCP/IP IPv6 Neighbor Discovery Protocol (ND)
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ICMPv6 Informational Message Options
(Page 5 of 6)

Redirected Header Option Format

In a Redirect message, provides a copy of the original message (or a portion of it) that led to the Redirect being generated. This option can be found in Table 118 and Figure 167.


Table 118: ICMPv6 Redirected Header Option Format

Field Name

Size (bytes)

Description

Type

1

Type: Identifies the ICMPv6 option type. For the Redirected Header option, the value is 4.

Length

1

Length: The length of the entire option (including the Type and Length fields), expressed in units of 8 octets (64 bits).

Reserved

6

Reserved: 6 reserved bytes sent as zeroes.

IP Header + Data

Variable

IP Header + Data: As much of the original 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 167: ICMPv6 Redirected Header Option Format

 

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