SecurityFocus
Site maintains an extensive database of vunerabilities and solutions including Denial Of Service attacks.

Smurf Amplifier Registry
The SAR lets you probe Internet connected IP networks to see whether or not they are configured in a way that will allow perpetrators to use them for smurf amplification.

Denial of Service (DoS) Resource Page
Collection of articles and links about Denial of Service attacks

DoShelp.com
Tools and patches to protect a person's computer from hackers, Denial of Service, and other intrusions.

Denial of Service Help Page
Advice for victims of Denial Of Service Attacks, geared towards users of IRC (Internet Relay Chat)

Microsoft Windows Update
Latest bugfixes for Microsoft Windows, including fixes for some possible DoS attacks.

Cisco
Strategies to protect against distributed denial of service (DDoS) attacks. This article applies primarily to sites using Cisco equipment.

Tools Stunt DoS Attack
InternetWeek article written in the aftermath of the Denial of Service attack on Microsoft's domain name servers discusses various ways to combat these tactics.

Hacking the DoS
An interview on hacking and denial of service attacks with Brian Martin and David Dittrich. Available in text and various forms of audio.

Smurf Attack Information
White paper describing and giving information on how to minimize the effects of smurf attacks.

Distributed Denial of Service (DDoS) Attacks and Tools
A bibliography of recent papers and advisories on DDoS attacks and tools, by David Dittrich of the University of Washington (USA).

CERT Advisory CA-2000-01
Denial of Service developments including description, impact, and solutions.

Trinoo Analysis
An analysis of the DoS Project's trin00 master/slave programs, which implement a distributed network denial of service tool.

Stacheldraht Analysis
An analysis of "stacheldraht", a distributed denial of service attack tool, based on source code from the "Tribe Flood Network" distributed denial of service attack tool.

Defying Denial of Service Attacks
Discussion of the main DoS methods and how to protect your PCs and servers from them. [NetworkMagazine.com]

Sans Institute Global Incident Analysis Center
Special notice and analysis of Rootkit/Smurf Payload Toolkit v 1.1.

Distributed Denial of Service Attacks
A DDOS exploit multiplies the disruptive power of denial of service attacks. The article discusses methods used and how to detect them. [NetworkMagazine.com]

DDoS Is Neither Dead Nor Forgotten
How DDoS attacks have developed over the past year, and what has been learned; preparation is essential to prevention. [NetworkMagazine.com]

Whatis Definition of Denial of Service
Definition plus discussion of various types of DoS attacks and how they work, including Buffer Overflow, SYN, Teardrop and Smurf.

DDoS World
Knowledge base: including news articles, white papers, and advisories.

ACM: Ubiquity - Distributed Denial-of-Service Attacks
Article by M. E. Kabay about the effect of DDoS attacks on major e-commerce sites, and the legal ramifications thereof.

GCN.com: How to Stop a Service Denial Attack Before It Stops You
Shawn P. McCarthy provides a quick overview of various kinds of DDOS attacks. He also explains why defending against this type of attack requires upstream infrastructure providers to cooperate with the victim.

Denial of Service Database
Details of many attacks: categorized by platform affected and using OSAT notation. No longer updated.

CERT Incident Note: DoS Attacks Using Nameservers
Description of how intruders are using nameservers to execute packet flooding denial of service attacks.

Red Hat Linux General Security Advisory
Updated bind packages fixing DoS attack.

GRC.com: Denial of Service Investigation and Exploration Pages
Analysis and investigation of the DoS threat posed by Windows XP, and reports and logs from when GRC.com was the victim of a DDoS attack.

Internet Storm Center - Slammer Worm Analysis
Detailed analysis of the Slammer worm responsible for recent widespread denial of service activities

Zombie Zapper
Free, open source tool that can tell a zombie system to stop flooding. Zombie Zapper works against Trinoo, TFN, Stacheldraht, Troj Trinoo (the trinoo daemon ported to Windows), and Shaft.

National Infrastructure Protection Center (NIPC)
The National Infrastructure Protection Center (NIPC) serves as a national critical infrastructure threat assessment, warning, vulnerability, and law enforcement investigation and response entity.

DDOS Class Action Lawsuit
Organization and discussion of class-action lawsuits by victims of DDOS attacks.

10 Proposed 'First-Aid' Security Measures Against Distributed Denial Of Service Attacks
Whitepaper detailing "easy and fast to implement methods to protect against those attacks." [PDF format]

Netscan.org
Public service which proactively scans for networks acting as smurf amplifiers.

Magnification Attacks: smurf and fraggle
Security whitepaper describing some common magnification attacks, what they are, and how to avoid them.

Denial of Service (DoS) on the Internet
Academic paper and slides on Denial of Service attacks.

Riverhead Networks
Offers managed products and services for DDoS mitigation and detection.

Webscreen Technology
Offers filtering appliances with DDoS mitigation features.

Network Ingress Filtering
A simple, effective, and straightforward method for network administrators to prohibit DoS attacks which use forged IP addresses.

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]