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

ICMPv4 Timestamp (Request) and Timestamp Reply Messages 1 2 3 4 ICMPv4 Address Mask Request and Reply Messages

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.

Figure 149: ICMPv4 Router Solicitation Message Format

ICMPv4 Timestamp (Request) and Timestamp Reply Messages 1 2 3 4 ICMPv4 Address Mask Request and Reply Messages

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