How Do I Effectively Block an IP Address on My Network? or What's the Best Way to Block an IP Address

Hey, networking nerd here. Blocking an ip address at the router is fine, but if it’s not working, your router might be applying the rule too late in the process.

Try a hardware firewall or even a cheap managed switch with ACLs (Access Control Lists). Ubiquiti gear is great for this.

Also, wireshark can help you verify if the traffic is really being blocked.