DDoS
There is an Apache module that was created to prevent a DDoS attack, although it's probably not installed by default. Follow these steps to install the module.
DOSHashTableSize 2048 DOSPageCount 20 # maximum number of requests for the same page DOSSiteCount 300 # total number of requests for any object by the same client IP on the same listener DOSPageInterval 1.0 # interval for the page count threshold DOSSiteInterval 1.0 # interval for the site count threshold DOSBlockingPeriod 10.0 # time that a client IP will be blocked for DOSLogDir "/var/log/apache2/evasive" DOSEmailNotify admin@domain.com
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