load balancing on apache

[Hemant Singh]

Hi All   I am planning to host an application and its size is going to be big one , so expect the concurrent number of connection s to be around 2200.To combat the same , want to perform load sharing on 3-4 servers.So the ide is to put one machine on external IP and this machine , after receiving the requests would forward them to any of the other three machines having the application deployed and running on the same environment.Pls suggest how can i achieve this on apache.   Thanks in advance Hemant