December 2007
Intermediate to advanced
672 pages
19h 21m
English
book
Router Security Strategies: Securing IP Network Traffic Planes
by Gregg Schudel - CCIE No. 9591, David J. Smith - CCIE No. 1986
Content preview from Router Security Strategies: Securing IP Network Traffic Planes
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Appendix B. IP Protocol Headers
Many network attacks are accomplished by manipulating or spoofing the packet header fields within TCP/IP protocols. With few exceptions, these protocol header fields can be manipulated or spoofed by an attacker to achieve one of two broad goals: circumvent security policies (to steal or modify data), or cause a denial of service (DoS) condition somewhere within the network. The fact that protocol header value manipulation and spoofing can be used to accomplish these goals is made possible because of the following reasons:
• Protocol weaknesses: Many protocol definitions are insufficiently specific or lack inherent security mechanisms, leaving them exposed to manipulation and spoofing. For example, ICMP is designed ...
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