@vmonkey You make a good point with cable modem. I can relate: my Canadian ISP recently replaced my cable modem with new model and I lost the ability to configure DNS servers. I was using AdGuard on...

@vmonkey If you don't mind, a question about your network setup. I, too, have Synology NAS. I just checked its standard DHCP server: it is very basic, if not primitive. Very few configuration...

@Craig_A4 You have TP-Link brand powerline adapters, they should be fine with TP-Link Deco. One more thing: the unmanaged switch must be compatible with Deco mesh Ethernet backhaul, too. More info on...

@Craig_A4 This setup is possible and should work. The only caveat is not every brand of powerline adapters is compatible with Deco mesh Ethernet backhaul. Worst case, you may also need to replace...

@KingKoen You have different network setup than I expected. This is what I expected: The scenario I described is applicable to this setup, and not to what you have. Sorry, out of ideas with what...

@KingKoen There must be networking switch connected to the second port of Main Deco, and Satellite Decos as well as other hardwired devices on your network pass Internet traffic through that switch...