@JFT Hi Not sure how you connect your whole network. But I guess you have two Modems connected to the ER5120 and they have the same subnet? My suggestion is to change the Modem's IP to some other...

@FreeSamples Under LAN Interface you only choose the port for the Gateway（which LAN port will send out this VLAN Tagged data） For the switch you need to go to Devices list-> Choose the Switch-> Port

@esaad86 Maybe try to change the Channel to 36 or 48 to see if there is any difference?

@AhmetAkkaya Hi I also cannot see anywhere to modify this "5 minutes time". It seems to be designed to be like that. But You can refresh the list manually.

@GustavoAlberto Hi Did you change anything on the openVPN config file? What is the VPN IP pool you use for this VPN tunnel? Try make the VPN IP pool different from your LAN local subnet. Related...

@Jimblas You Client CPE is running on which Mode? I guess you are not using "Client" but actually "AP Client Router " Mode? If you are not able to Ping AP from Client, that means Client CPE does not...