Yes - I realized after I wrote it that I do need to be on their network.

But, the way they describe it - that coax isn't coming from the router; it's coming direct from the ONT (which doesn't make sense to me either).

Basically, I don't need WiFi - I can get that with my laptop. But my desktop (which has no Wifi adapter) needs to connect to a switch (which also connects my Synology device). Then, I access the desktop (my "server") with my laptopl In the past, I ran an ethernet cable between their WiFi extender and my switch; they're now removing that extender.

This was what he told me to buy to replace it: https://www.amazon.com/Actiontec-Wcb3000n01-Wireless-Extender-Network/dp/B00V5EOXFS/ref=sr_1_2?crid=INN244KKG0N4&keywords=actiontec+wcb3000n01&qid=1688315045&sprefix=actiontec+wcb3000%2Caps%2C939&sr=8-2&ufe=app_do%3Aamzn1.fos.18630bbb-fcbb-42f8-9767-857e17e03685

But, again, I'd prefer to not spend $65 on a six-week solution; if I can get something used :)