Microsoft ISA Server or Internet Security and Acceleration Server easily manages connections between the networks. Following are the features and pre-requisites of ISA Server :
Administrative access to the ISA Server that you are using is really important as you will be able to clarify the physical network connected to ISA Server. You will be able to do this due to the multi network model used by ISA Server. Prior to this, make sure that you create networks in ISA Server 2006 as this is the basic element of the server.