Sadly, I'm a noob - but I have been trying and failing for hours and hours.
The long and short of it is, I can set my DM200 to modem & router mode, set to DHCP and then put in a client ID, and everything works fine. This device does not have OpenWRT on it. When I set my DM200 to modem only mode and pass the connection to my 3200ACM, I am getting nowhere.
I've read many conflicting ideas and reports - but my initial instinct was that my 3200ACM (router from here on) would just do the same DHCP job that the modem was doing previously. No joy, everything seems fine and it even seems to show packets sending and receiving but there is no connection at all under 'Network, or pinging in diagnostics.
I then read something about actually using PPPoE on the router side, so I have tried that. I have no PPPoE details for my provider (Sky - UK) but after some research I found something to use. This gives me no packets and an error "Unknown error (USER_REQUEST)".
I've tried a lot of things and fiddled with just about everything but there could be something I just don't know or have missed in my searches. That is why I am here, because I am a noob and am unsure what to do next. Any pointers or ideas would be greatly appreciated.
Late notes : I read something about the DM200 firmware, I have tried old and new. Also I am unsure about which physical interface I am to select for my WAN device. I assume it is eth0 but I have tried them all.
Thank you very much for your time and I apologise if I've missed something obvious!