Increase maximum number of concurrent connection from 12 to 100 in IIS7

Hi,

At present in my organization I am using Windows Server 2008R2 + IIS7.0 + .netv4.0(Integrated mode) and also we have 4core processor. While we are checking its identified that the number of maximum concurrent connection is 48 (12*4) and rest of them are getting Request Timeout. Can anyone suggest me that how to increase the maximum number of concurrent connection from an IP address to 1000.

Regards..

Thanks & regards...

Sankar