@Gerbil Yes, to be able to connect the PPPoE session from your PC you have to be in bridge mode on the modem. If Internet access is mandatory at the moment, just do these tests while noone uses it...

@Gerbil Follow this guide to troubleshoot the error. Don't use the PowerShell script for VLAN ID, you're doing it right so far.

@liquidguru You're targeting Primary DNS field.

@liquidguru Go through this thread to find your answer.

@Fahl I misunderstood your description - you're referring to C2300 hairpinning. TBH I am not sure if it supports it - the only thread I've found on that matter is here.

@Barcafan You can't have mesh network between two routers - Q10/A10. Your R600VPN is a SafeStream Gateway, part of the Omada-SDN solution for business. You can buy a JetStream switch like TL-SG2008...