mod_limitipconn is an Apache which allows web server administrators
to limit the number of simultaneous downloads permitted from a single
IP address.

The module can be loaded with the following in /etc/httpd/httpd.conf

LoadModule limitipconn_module lib/httpd/modules/mod_limitipconn.so
ExtendedStatus On
MaxConnPerIP 5

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