Somehow I was able to get it to work. I am not sure exactly how, but something about the order of how I connected some cables and not others seems to have mattered, and I started only one switch at a...

I am an idiot. I am not using MAC filtering, because I never set it up. I didn't understand what that meant when you asked earlier, I thought that meant how the router uses MAC addresses by default....

OK, I checked this and I have Access Control turned off. I am definitely using MAC filtering. Should I try Access Control instead of MAC filtering?

In case it helps, my set up is a router in my office, which is hardwired to three things: 1) Another router downstairs, set up as an access point with the traditional 4 LAN ports (this AP has both...

Thanks for the reply. I am pretty sure I am using MAC filtering, but I am not sure because I don't fully understand what Access Control means. I did test all the cables and ports. All the cables...

I have a TP Link router, Archer C9 v5, and I added two new switches to my network, TP Link SG105. They are 5 port unmanaged switches, so I expected them to be plug and play. Sadly the router is not...