How do I change the MTU size if I'm experiencing connection problems?
Log in to the router at http://www.routerlogin.net, go to ADVANCED > Setup > WAN Setup, and enter a value between 64 and 1500 in the MTU Size field. A common troubleshooting value is 1400. Only change the MTU if you're experiencing specific connection problems or per ISP/NETGEAR technical support recommendations.
From the official Netgear Nighthawk R7000P WiFi Router manual, page 35
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