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Practical Packet Analysis, 2nd Edition
book

Practical Packet Analysis, 2nd Edition

by Chris Sanders
June 2011
Intermediate to advanced content levelIntermediate to advanced
280 pages
7h 56m
English
No Starch Press
Content preview from Practical Packet Analysis, 2nd Edition

Internet Control Message Protocol

Internet Control Message Protocol (ICMP) is the utility protocol of TCP/IP, responsible for providing information regarding the availability of devices, services, or routes on a TCP/IP network. Most network troubleshooting techniques and tools center around common ICMP message types. ICMP is defined in RFC 792.

The ICMP Header

ICMP is part of IP, and it relies on IP to transmit its messages. ICMP contains a relatively small header that changes depending on its purpose. As shown in Figure 6-29, the ICMP header contains the following fields:

Type The type or classification of the ICMP message, based on the RFC specification
Code The subclassification of the ICMP message, based on the RFC specification
Checksum Used to ...
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Publisher Resources

ISBN: 9781593272661Errata