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Tech nerds: if you have a lot of Ring cameras on your network, be aware that a longstanding bug causes them to try to poison ARP for your default gateway. Here's an example message from my FreeBSD server, on which I have created a permanent entry for my default gateway in the ARP table:

Dec 14 01:18:00 <kern.err> turing kernel: arp: 90:48:6c:xx:xx:xx attempts to modify permanent entry for 192.168.1.1 on em0

The MAC address belongs to a #Ring "stick up" camera. They all do this.