Not getting 2Gb speeds

First thing to check is the connection rate of your NIC. I will assume you have Windows OS unless you state otherwise. If not 2.5Gbps then something is either wrong with the NIC, ethernet or gateway. If that is good, maybe something on your network is using the extra bandwidth. Try putting the gateway in bridge mode, but make sure your test PC is the only thing plugged in via ethernet to the gateway. If that doesn't work, my guess would be a issue with how the gateway is provisioned. Try calling and asking for Tier 2(AKA CAG) to see if they can check your gateway's configuration file. Last, check your signal levels and make sure you have 2 downstream OFDM channels and 1 upstream OFDMA channel. If you don't your area isn't ready for 2Gbps yet. To see signal levels, go to 192.168.0.1 > user;admin password;password (unless changed) > Connection > Cox Network. You will have to scroll down a bit but the downstream and upstream data should be there.