If there is a site that should be listed here or if a link goes dead, .

• Analysis of attack on GRC
  original at GRC.com(June 2001)
  
• Denial of Service (DoS) Attack Resources
  
• Attrition.org : Denial of Service (DoS) Db
  CERT Coordination Center : Denial of Service Attacks
  Cisco : Strategies to Protect Against Distributed Denial of Service (DDoS) Attacks
  Distributed Denial of Service Attacks - Steve Michael Bellovin
  Distributed Denial of Service (DDoS) Attacks/tools
  
• DDoSPing : utility for remotely detecting the most common DDoS programs
  detect Trinoo, Stacheldraht and Tribe Flood Network programs, NT, free
  
• Have Script, Will Destroy (Lessons in DoS)
  
• Microsoft's Best Practices for Preventing DoS/Denial of Service Attacks
  
• PacketStorm Proof of concept DoS exploits
  Lots of exploit examples
  
• RFC 2827: Defeating Denial of Service Attacks which employ IP Source Address Spoofing (June 2001)
  
• SANs: Help Defeat Denial of Service Attacks
  
• Tools
  • RID Remote Intrusion Detector (Dec 2001)
    
  • Razor's Zombie Zapper (Dec 2001)
    free, open source tool that can tell a zombie system flooding packets to stop flooding. The new 1.2 version works against Trinoo (including the Windows Trinoo agent), TFN, Stacheldraht, and Shaft. It does assume various defaults used by these attack tools are still in place, but allows you to put the zombies to sleep.
  • DDS a trinoo/TFN/stacheldraht agent scanner (C source code) (Dec 2001)
    
  • GAG a stacheldraht agent scanner (C source code) (Dec 2001)
    
• TRINOO - The DoS Project's "trinoo" distributed denial of service attack tool (Dec 2001)
  
• Tribe Flood Network distributed denial of service attack tool (Dec 2001)
  
• DoS Anti-DDOS Vendors :
  • Arbor Networks' Peakflow DoS
    (October 2001)
    
  • Asta Networks' Vantage System (October 2001)
    
  • Captus Networks' Captl0 (October 2001)
    
  • Mazu Networks' TrafficMaster (October 2001)