Before going further, you should know that the C6220 is not built for being used as a wireless extender. What does work more reliably is using the Netgear extender with the C6220 as the main router, or using the C6220 plus wired link to another access point/extender. https://mywi-fiext.net/wifi-extender-with-netgear-ac1200-model-c6220/