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17.4.3.4. Resource Management Options
The
xinetd daemon can add a basic level of protection from a Denial of Service (DoS) attacks. Below is a list of directives which can aid in limiting the effectiveness of such attacks:
per_source— Defines the maximum number of instances for a service per source IP address. It accepts only integers as an argument and can be used in bothxinetd.confand in the service-specific configuration files in thexinetd.d/directory.cps— Defines the maximum of connections per second. This directive takes two integer arguments separated by white space. The first is the maximum number of connections allowed to the service per second. The second is the number of secondsxinetdmust wait before re-enabling the service. It accepts only integers as an argument and can be used in bothxinetd.confand in the service-specific configuration files in thexinetd.d/directory.max_load— Defines the CPU usage threshold for a service. It accepts a floating point number argument.
There are more resource management options available for
xinetd. Refer to the chapter titled Server Security in the Security Guide for more information, as well as the xinetd.conf man page.
