I have been using a cable modem gateway - Netgear CGD24G from Charter for two years. I just bought Netgear R6300 wifi rounter in order to upgrade the speed and range for my internet. My goal is to upgrade 802.11g to 802.11ac. Is there any special way to setup it up? Or do I need to contact Charter to replace a new gateway? I am totally new about network and would be appreciate some tips and answers here. Thank you.