Hello friends, The Orbi system is designed to work with your existing modem or router. However, it is recommended that you turn off the Wi-Fi on the existing ISP modem or router (if it has wifi) to improve the performance of the Orbi. If the modem does not have router functionality, the Orbi can be set to router mode. For more info- Orbi Setup Orbi Router Login Setup Netgear Orbi
