XR100 ARP / MITM cowards

I've been using a combination of Wireshark and Xarp to minitor these attacks as they happen and I'm wondering if there are any settings I can adjust on the router to better protect against this hack.

The systems/machine used in this hack don't actually show up on my router but on the monitoring software. They're are as clear as day. And while I've learned to detect them in real time, I'm still learning and I'm not exactly sure what settings I can change on my end to mitigate this nonsense.

Thanks.