I've been using a Linksys WRT1900ACSv2 running the latest LEDE for routing and wifi without many hiccups, but for some reason it doesn't seem to be able to initiate a PPPoE connection to my ISP in the same way the manufacturer firmware does.
I use a TD-W9970 in bridge mode to provide the VDSL2 modem, and when running the manufacturer firmware on the WRT1900ACS I'm able to input my ISP credentials into its web interface, dial a PPPoE connection and reach the internet with the WRT1900ACS as my network edge for FW, NAT etc.
However when I switch the WRT1900ACS over to LEDE and input the same PPPoE credentials into Luci (again with the TD-W9970 in bridge mode), LEDE doesn't seem able to dial my ISP correctly. The interface is populated and started, but RX/TX remain at zero.
Ideally, I'd like to be able to use the external modem as a bridge only and have LEDE on the WRT1900ACS dial PPPoE and act as the edge. I'm an enthusiast but not an expert; could anyone advise where I may be going wrong? I've read I may need to specify a VLAN for the PPPoE interface, but I'm not sure how I'd capture the right setting for my ISP from the manufacturer firmware as the Linksys web interface isn't very informative.