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Denial of Service Attack

Yahoo! offline for about 3 hours

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Hackers Take Down Yahoo!

by Dave Murphy
ISSN 1535-3613

Dave Murphy, DGL President & ITrain founder Yahoo! did not have a good day yesterday. A malicious attack rendered the popular portal inaccessible Monday from about 10:30a.m. until 1:30p.m. PST.

A coordinated, multi-point attack on Yahoo!'s California data center shut down the site sporadically. The so-called "distributed denial of service attack" works by bombarding servers with so much fake traffic that genuine traffic cannot get through. Yahoo!'s system admins quickly discovered the problem and their redundant servers on the East coast picked up the overload.

About 1:30p.m., filters were installed on the routers that blocked the bogus request. Soon thereafter, normal traffic patterns were restored.

A meeting is scheduled this afternoon where the FBI and Yahoo! managers will decide if further FBI involvement is warranted.

The attack originated from 50 different Internet Protocol (IP) addresses, according to the Yahoo! representatives. Up to 1 gigabyte (GB) of requests per second flooded Yahoo's routers.

I think Yahoo! is believed to be the biggest site ever to be forced offline by a denial-of-service attack.

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updated February 8, 2000
http://dgl.com/itinfo/2000/it000208.html

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