We have a small office setup with server and LAN with 5 computers. One of them is an E-Mail computer acting as E-Mail server (different from Main Server). As this site office is remote we have to connect to our main office via Satellite communication. The satellite device gets a Public IP from ISP and is also DHCP server and can assign private IP same as that of existing network. How can i get this device on our lan without disturbing the existing network ?