July 2004
Beginner to intermediate
832 pages
20h 56m
English
Content preview from The Tao of Network Security Monitoring Beyond Intrusion DetectionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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A. Protocol Header Reference
The protocol headers presented in this appendix are frequently encountered when analyzing TCP/IP traffic. An excellent online reference not mentioned elsewhere is the Network Sorcery site (http://www.networksorcery.com). This site clearly breaks down protocols by network, transport, and application layers by noting the following.
• Network-layer protocols are assigned EtherTypes, like 0x0806 for ARP, 0x0800 for IP version 4, and 0x86DD for IP version 6.
• Transport-layer protocols are assigned IP protocol values, like 1 for ICMP, 6 for TCP, 17 for UDP, 132 for Stream Control Transmission Protocol (SCTP), and so on.
• Application-layer protocols are assigned one or more SCTP, TCP, or UDP port numbers, like 23 for Telnet, ...
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