CERT Advisory CA-2000-01 Denial-of-Service Developments 
Denial of Service developments including description, impact, and solutions.
Cisco
Strategies to protect against distributed denial of service (DDoS) attacks. This article applies primarily to sites using Cisco equipment.
DDoS Detection research (IDS, SYN, DRDoS, TFN2K)
An academic research paper on DDoS detection including attack simulation based on TFN2K, detection platform and analysis. [Requires PowerPoint]
DDoS World
Knowledge base: including news articles, white papers, and advisories.
Defeating DDoS
An illustrated white paper describing Distributed Denial of Service (DDoS) attack methodology and prevention.
Denial of Service attacks and countermeasures
Presentation notes and illustrations on denial of service attacks and countermeasures given at the University of Rome "La Sapienza"
Denial of Service Attacks White Papers, Webcasts and Product Information from Top IT Vendors
Research the latest Denial of Service Attacks technologies, tools and techniques. Read white papers, case studies, webcasts and product information from multiple vendors.
Denial of Service Database
Details of many attacks: categorized by platform affected and using OSAT notation. No longer updated.
Denial of Service (DoS) on the Internet
Academic paper and slides on Denial of Service attacks.
Denial of Service (DoS) Resource Page
Collection of articles and links about Denial of Service attacks
Denial of Service Help Page
Advice for victims of Denial Of Service Attacks, geared towards users of IRC (Internet Relay Chat)
Denial-of-service attack
Description of DDoS and prevention resources from Wikipedia Encyclopedia.
Distributed Denial of Service - Protecting Critical Systems
White paper describing and giving detailed information on distributed denial of service (DDoS) attacks and prevention and intervention methods. Illustrated.
Distributed Denial of Service (DDoS) Attacks/tools
Link resources for understanding, diagnosing and preventing DDoS attacks.
DoShelp.com
Tools and patches to protect a person's computer from hackers, Denial of Service, and other intrusions.
GRC.com: Denial of Service Investigation and Exploration Pages
Analysis and investigation of the denial of service threat posed by Windows XP, and reports and logs from when GRC.com was the victim of a DDoS attack.
Magnification Attacks: smurf and fraggle
Security white paper describing some common magnification (smurf) attacks, what they are, and how to avoid them.
Microsoft Windows Update
Latest bug fixes for Microsoft Windows, including fixes for some possible DoS attacks.
Netscan.org
Public service which proactively scans for networks acting as smurf amplifiers.
Network Ingress Filtering
A simple, effective, and straightforward method for network administrators to prohibit DoS attacks which use forged IP addresses.
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