maximum number of connections allowed from public IP address

We're using pool-member connection limits to prevent servers being overloaded. We can see from the statistics that these limits are being hit. The same statistics suggest that we're hitting the sum of all of the member limits, which would imply that we're turning some connections away..i have the similar requirement ....would like know how to get historical connection reports for pool member...i can find current connection report of the pool but not historical...,i need historical data same with time period wise like take every 30 min ...if any body have option,please reply..