Hashemian Blog Huh? What? Wednesday, July 28, 2004 DDoS – Deliberate Denial of Service A week ago one of our salespeople approached me with a simple question. Some of the people in his client company were unable to browse to our company’s Web site. He was rather embarrassed at the prospect that our company’s Web site (and by extension, our company) could be viewed as shaky and unreliable. While I am biased, I believe our Web site is highly reliable and it operates as flawlessly as they come. Sure, there are the occasional hiccups, but in most cases reported issues have been at the users’ end and not ours. So after carefully examining the Web server and running some internal and external tests, I declared our systems healthy and asked the salesperson to relay the findings back to the company. We all agreed that our Web site appeared completely accessible. Even employees from other departments at the same company had no problems reaching our site. The problem was spotty and I speculated that the company’s IT department should be able to resolve it rather quickly. But a few days later I received an interesting email from their IT manager. They had inspected their systems and had found no issues on their end. They were prepared to dig deeper into the problem, but they made a simple request first. “I would like to ensure that you are not blocking [our IP address] in an ACL list on your ingress router.”, the email requested. “Impossible”, I thought. But just to humor him I logged on to the firewall and looked up the deny list. And there it was, their IP address almost at the top of the list with my own note from over a year ago declaring it a rogue address due to packet flooding. Turns out that their network had caught a virus at that time and was flooding us causing a denial of service, and that had landed them in our deny list. This incident is now resolved, but I wonder how many deny lists like ours are there with old, dated, or even wrong information. It's a deliberate type of denial of service or reverse denial of service that can hamper progress on the Internet just as much as the real thing can. At least it keeps us employed. <> // posted by rh 0 comments | 0 Comments: Post a Comment

Links Technorati Profile TMCnet.com ARCHIVES 09/01/2003 - 10/01/2003 03/01/2004 - 04/01/2004 04/01/2004 - 05/01/2004 05/01/2004 - 06/01/2004 06/01/2004 - 07/01/2004 07/01/2004 - 08/01/2004 08/01/2004 - 09/01/2004 09/01/2004 - 10/01/2004 10/01/2004 - 11/01/2004 11/01/2004 - 12/01/2004 12/01/2004 - 01/01/2005 01/01/2005 - 02/01/2005 02/01/2005 - 03/01/2005 03/01/2005 - 04/01/2005 04/01/2005 - 05/01/2005 05/01/2005 - 06/01/2005 06/01/2005 - 07/01/2005 07/01/2005 - 08/01/2005 08/01/2005 - 09/01/2005 09/01/2005 - 10/01/2005 10/01/2005 - 11/01/2005 11/01/2005 - 12/01/2005 12/01/2005 - 01/01/2006 01/01/2006 - 02/01/2006 02/01/2006 - 03/01/2006 03/01/2006 - 04/01/2006 04/01/2006 - 05/01/2006 05/01/2006 - 06/01/2006 06/01/2006 - 07/01/2006 07/01/2006 - 08/01/2006 08/01/2006 - 09/01/2006 09/01/2006 - 10/01/2006 10/01/2006 - 11/01/2006 11/01/2006 - 12/01/2006

هاشمیان.com

 Home

 Blog

 Web Tools
Usage

 News

 Articles

 FAQ

 About

 Contact

 Financial Markets Book
Read Complete Book

BOOK
The 4-Hour Workweek: Escape 9-5, Live Anywhere, and Join the New Rich
Timothy Ferriss
$19.95

BOOK
Goode's World Atlas
$31.40

BOOK
The First Six Weeks of School (Strategies for Teachers Series, 2)
Roxann Kriete
$22.00

BOOK
Liberal Fascism: The Secret History of the American Left, From Mussolini to the Politics of Meaning
Jonah Goldberg
$27.95

BOOK
The Blank Slate: The Modern Denial of Human Nature
Steven Pinker
$16.00

|ddos-deliberate-denial-of-service-week|

more…