Low Orbit Ion Cannon (LOIC)
is an open source network stress testing and denial-of-service attack
application, written in C#. LOIC was initially developed by Praetox
Technologies, but was later released into the public domain, and now is hosted on several open source platforms.
The software has inspired the creation of an independent JavaScript version called JS LOIC, as well as LOIC-derived web version called Low Orbit Web Cannon. These enable a DoS from a web browser. (Source Wikipedia)
LOIC
basically turns your computer's network connection into a firehose of
garbage requests, directed towards a target web server. On its own, one
computer rarely generates enough TCP, UDP, or HTTP requests at once to
overwhelm a web server—garbage requests can easily ignored while legit
requests for web pages are responded to as normal.
But when thousands of users run
LOIC at once, the wave of requests become overwhelming, often shutting a
web server (or one of its connected machines, like a database server) down completely, or preventing legitimate requests from being answered.
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