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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 Advertisement and Router Solicitation Messages
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ICMPv6 Redirect Messages
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ICMPv6 Neighbor Advertisement and Neighbor Solicitation Messages
(Page 3 of 4)

ICMPv6 Neighbor Solicitation Message Format

The Neighbor Solicitation message format is much simpler, as depicted in Table 112 and Figure 161.


Table 112: ICMPv6 Neighbor Solicitation Message Format

Field Name

Size (bytes)

Description

Type

1

Type: Identifies the ICMPv6 message type; for Neighbor Solicitation messages the value is 135.

Code

1

Code: Not used; set to 0.

Checksum

2

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

Reserved

4

Reserved: 4 reserved bytes set to 0.

Target Address

16

Target Address: The IPv6 address of the target of the solicitation. For IPv6 address resolution, this is the actual unicast IP address of the device whose layer two (link-layer) address we are trying to resolve.

Options

Variable

Options: If the device sending the Neighbor Solicitation knows both its own IP address and layer two address, it should include the layer two address in a Source Link-Layer Address option. The inclusion of this option will allow the destination of the Neighbor Solicitation to enter the layer two and layer three addresses of the source of this message into its own address cache. See the discussion of IPv6 address resolution.



Figure 161: ICMPv6 Neighbor Solicitation Message Format

 


Key Concept: ICMPv6 Neighbor Advertisement and Neighbor Solicitation messages are similar in many ways to the Router Advertisement and Router Solicitation messages. However, rather than being used to communicate parameters from routers to hosts, they are used for various types of communication between hosts on a physical network, such as address resolution, next-hop determination and neighbor unreachability detection.



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ICMPv6 Router Advertisement and Router Solicitation Messages
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ICMPv6 Redirect Messages
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