Distributed Denial of Service Attacks by Brooks Richard; Özçelik İlker;

Author:Brooks, Richard; Özçelik, İlker;
Language: eng
Format: epub
Publisher: CRC Press LLC
Published: 2020-07-18T00:00:00+00:00

(10.2)

where NMinReq is the minimum number of web-caches required by the system.

10.4.1.6DDM Controller

The DDM controller performs three tasks: monitor, decide and perform periodically until it receives a controller stop or pause request (See Figure 10.12). The controller uses the data collection module to gather web-cache status information. If it receives a DEAD web-cache result, it takes the web-cache out of the client’s DNS records immediately and adds it into the controller watch list. If the web-cache returns back to the NORMAL state before the watch list timer expires, the controller adds it back to the system; otherwise the controller destroys the web-cache. The controller sends the web-cache statistics to the decision module. If the decision is 0, the system sleeps until the next data collection call; otherwise it invokes the action routine. In the action routine, the controller uses the resource manager and deflect module to create a new web-cache if the decision is positive, or destroy a web-cache if the decision is negative. Creating a new web-cache takes about 6 minutes on a host which has an Intel Core2 Duo 3GHz processor and 4GB ram. To control active web-caches while creating new ones, the controller also performs the monitoring task in parallel.

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