mkdir ipdrop
cd ipdrop
wget http://miksir.pp.ru/mod_ipdrop_v001/Makefile
wget http://miksir.pp.ru/mod_ipdrop_v001/mod_ipdrop.c
APXS=/usr/local/apache/bin/apxs make
APXS=/usr/local/apache/bin/apxs make install
vi /etc/httpd/conf/httpd.conf
/etc/init.d/httpd restart
## ##
# CONFIGURATION #
## ##
GlobalMaxConnectionsPerIP 10 10 10
IPDropDebug 1
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mod_ipdrop is already installed on server and configure it as follows
http://miksir.pp.ru/mod_ipdrop_v001/README