These guys [1] offer a layer 3 bridge that does ip shunning, with white listing and black listing built in. It supposedly operates at line speed (!) which is kind of remarkable. I'd like a device like this for my in laws, they don't sell to consumers though, so far as I know.
[1] https://www.riskanalytics.com/cyber-security-services/intell...
tptacek‘s Latacora security consultancy
check out https://www.threatcare.com
www.logichub.com
define interesting
Check out https://www.cspi.com/aria-software-defined-security/