You have the choice to turn off the DHCP function from the advanced network settings. I believe the bridged mode will give you the firewall transparency you want. In the process you will lose the friendly installation feature and the wifi mesh benefit. In a large installations where the mobile devices are ...Mobile, the roaming and fast handover from one node to another is very important. I do not understand why you want to dumb down your wifi. If you need advanced routing, this mesh device might not be the one for you. Look into Cisco-Meraki enterprise grade equipment. If the routing features of the EERO are sufficient, let the first node you connect be the router. It will work better than most mesh solutions for a decent price. Your backhaul traffic will be done over your existing ethernet so you do not really need a third frequency band.