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arcai.com's free Netcut application can help you protect your LAN from ARP spoofing and other unwanted intrusions. Netcut monitors LAN activity and displays the addresses and data of all devices connected to it. You can cut off service to any LAN user, change MAC addresses, modify your network adapter settings, and more with Netcut.
Run as Administrator: Netcut recommends that you run it as a system administrator to maximize its capabilities.
Protected by Netcut Defender: Netcut includes Netcut Defender's protection for the host PC, though you can add Netcut Defender to other computers on your LAN, too (it's free).
Cut them off: You can terminate and restore network access to any computer on your LAN at will with Netcut -- even as a prank, according to the documentation.
Stay safe: Netcut also offers tips and expert advice for keeping your wired or wireless LAN safe.
Not for the inexperienced: Netcut isn't difficult to use and has plenty of online resources, but it's not for beginners. Machine-translated documentation could confuse inexperienced users.
Speed bump: Netcut can be slow to respond at times and also slowed out connection speed a bit.
Netcut is a valuable tool for network administrators, and it offers an additional layer of protection against ARP spoofing (and the bad things that can follow). Netcut is free, so it's easy enough to test it in your network to see if it works for you.