Hello, "Normally" when you use ISA you have a private address space connected to the internal network adapter. When a client wishes to make a connection to a internet host this address is translated to the external interfaces IP (A long way of saying NAT). Is it possible to operate ISA with a "Public" or routable address space connected to the internal interace and to no have NAT performed? I am still wat to use ISA as the default gateway for all my internal hosts, I just don't want any address translation. The packets would appear to be from the internal clients IP. Just Curious. Bill