Certainly, Integrated Load Balancer (ILB) is one of the most attractive features of Oracle Solaris 11 because it provides network layer 3 and 4 with the load balance service. Basically, when a client requires a resource from an application (for example, a web server), the ILB framework decides which backend host (for example, web server A or B) will attend the request. Therefore, the main role of ILB is to decide to which backend server (for example, the Apache web server) the request will be forwarded. ILB supports two work methods in Oracle Solaris 11: Direct Server Return (DSR) and Network Address Translate (NAT). In both cases, the ILB framework uses one of four algorithms: