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NAT, or Network Address Translation, is a way of assigning additional non-routable IP addresses to an Internal network which packets are forwarded from a single external Internet routable IP address. (One or more external routable IP addresses may be used.)NAT, or Network Address Translation, is a way of assigning additional non-routable IP addresses to an Internal network which packets are forwarded from a single external Internet routable IP address. (One or more external routable IP addresses may be used.) Double NAT is a scenario where multiple routers on network are doing network address translation. Common example is a Cable or DSL modem, to which a Wi-Fi router is connected. Both modem and router have NAT enabled. Computers on the network are connected to Wi-Fi router. Your ISP is not supposed to give you an already NAT address to your CPE (the router). HughesNet is already using NAT on their side, giving all their customers a NAT address to their client premises router, which does NAT again, resulting in twice NAT. Hughesnet will not allow the customer to operate the router they install in pass-through mode. The client is stuck with a double NAT setup which makes VPN nearly impossible. If the client adds a wireless router the double NAT goes to a possible triple NAT situation. Double NAT is Double Routing using non-Internet IP addressing. Hughesnet doesn't provide the customer any Internet router IP address. == DNS Lookup Error ==