Ah, I know absolutely nothing about the subject and would like to read up on it. So could one simply duplicate another user’s serial number and then successfully receive and decode their inbound data?
Nope. The same serial number cannot be online twice.
I have also tried swapping my ONT and my neighbours ONT (both on the same PON) and neither authenticated.
I was testing to see if you could simply spoof a neighbours ONT serial number and connect to their broadband.
We are both with Talktalk so it's DHCP, no password.
I was half expecting the ONT's to authenticate and us to connect to each others accounts but Openreach must somehow be able to detect which part of the split you are on?
Either that or the engineer was incorrect and we are on separate PONs, but I doubt that.