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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 6 of 6)

MTU Option Format

The MTU option lets a router convey a recommended MTU value in Router Advertisement messages. Its format is described in Table 119 and Figure 168.


Table 119: ICMPv6 MTU Option Format

Field Name

Size (bytes)

Description

Type

1

Type: Identifies the ICMPv6 option type. For the MTU option, the value is 5.

Length

1

Length: The length of the entire option (including the Type and Length fields), expressed in units of 8 octets (64 bits). The MTU option is fixed in length at 8 bytes so the value of this field is 1.

Reserved

2

Reserved: 2 reserved bytes sent as zeroes.

MTU

4

MTU: The maximum transmission unit (MTU) value, in bytes, that the router is recommending for use on the local link.


Figure 168: ICMPv6 MTU Option Format

 

 


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