The TCP/IP Guide - ICMP Overview, History, Versions and Standards

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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 Concepts and General Operation

ICMP Concepts and General Operation

ICMP General Operation

ICMP Overview, History, Versions and Standards
(Page 3 of 3)

Other Standards That Define ICMP Messages

Both versions of the protocol define a general messaging system that was designed to be expandable. This means that in addition to the messages defined in the ICMP standards themselves, other protocols may also define message types used in ICMP. Some of the more important of these are shown in Table 85.

**Table 85: Non-ICMP Internet Standards That Define ICMP Messages**
ICMP Version of Message Types Defined	RFC Number	Name	ICMP Message Types Defined
ICMPv4	950	Internet Standard Subnetting Procedure	Address Mask Request, Address Mask Reply
	1256	ICMP Router Discovery Messages	Router Advertisement, Router Solicitation
	1393	Traceroute Using an IP Option	Traceroute
	1812	Requirements for IP Version 4 Routers	Defines three new codes (subtypes) for the Destination Unreachable message.
ICMPv6	2461	Neighbor Discovery for IP Version 6 (IPv6)	Router Advertisement, Router Solicitation, Neighbor Advertisement, Neighbor Solicitation, Redirect
ICMPv6	2894	Router Renumbering for IPv6	Router Renumbering

The topic on ICMP message classifications, types and codes includes a full list of the ICMPv4/ICMPv6 message types covered in this Guide and the standards that define each.

ICMP Concepts and General Operation

ICMP General Operation

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