Very simple setup. Trying Switch chip port isolation. This router/switch does have a switch chip. Reset configuration to default OOB. Switch > Port Isolation > set every port to Override Forwarding to only ether1. How is it at all possible that two hosts on different ports can still contact each other?
I used this to help me: https://www.youtube.com/watch?v=QbdDzRcD8k8
