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ICMP Version 4 (ICMPv4) Error Message Types and Formats
ICMP error messages are used by routers
and hosts to tell a device that sent a datagram about problems encountered
in delivering it. In the original ICMP version 4, five different error
messages are defined, which are all described in the original ICMP standard,
RFC 792. These are some of the most important ICMP messages, since they
provide critical feedback about error conditions and may help a transmitting
device take corrective action to ensure reliable and efficient datagram
In this first of four sections on
specific ICMP types, I look at the ICMPv4 error messages. I begin with
Destination Unreachable messages, which are sent due to datagram
delivery failures, and Source Quench messages, used to tell a
device to slow down the rate at which it sends datagrams. Next I describe
Time Exceeded messages, sent when a datagram has been traveling
the network too long or takes too long to be reassembled from fragments,
and Redirect messages, which let a router provide feedback about
better routes to a host. Finally, I discuss Parameter Problem
messages, a generic catch all type used for problems not
covered by other ICMP error messages.
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The TCP/IP Guide (http://www.TCPIPGuide.com)
Version 3.0 - Version Date: September 20, 2005
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