mod_limitipconn is an Apache which allows web server administrators to limit the number of simultaneous downloads permitted from a single IP address. You'll need to add the following line to your /etc/httpd/httpd.conf: Include /etc/httpd/extra/mod_limitipconn.conf To test the 'test.pl' utility from mod_evasive is included in the doc dir. Which when run multiple simultainus sessions of should similate accessive connectivity; e.g. with MaxConnPerIP set to ``1'' while true; do (perl ./test.pl &); perl ./test.pl; done