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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 4 (ICMPv4) Informational Message Types and Formats

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ICMPv4 Timestamp (Request) and Timestamp Reply Messages
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ICMPv4 Address Mask Request and Reply Messages
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ICMPv4 Router Advertisement and Router Solicitation Messages
(Page 3 of 4)

ICMPv4 Router Solicitation Message Format

ICMPv4 Router Solicitation messages are much simpler, because they only need to convey a single piece of information: “if you are a router and can hear this, please send a Router Advertisement to me”. The format is therefore just the trivial set of fields shown in Table 99 and Figure 149.


Table 99: ICMPv4 Router Solicitation Message Format

Field Name

Size (bytes)

Description

Type

1

Type: Identifies the ICMP message type. For Router Solicitation messages the value is 10.

Code

1

Code: Not used; value 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 sent as 0.



Figure 149: ICMPv4 Router Solicitation Message Format

 


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