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ratecontrol Enable simple ruleset to do connection rate control
checking. This requires entries in access_db of the form

ClientRate:IP.ADD.RE.SS LIMIT

The RHS specifies the maximum number of connections
(an integer number) over the time interval defined
by ConnectionRateWindowSize, where 0 means unlimited.

Take the following example:

ClientRate:10.1.2.3 4
ClientRate:127.0.0.1 0
ClientRate: 10

10.1.2.3 can only make up to 4 connections, the
general limit it 10, and 127.0.0.1 can make an unlimited
number of connections per ConnectionRateWindowSize.

See also CONNECTION CONTROL.