Hi amuren
You don't need to sell it, just be vey careful with what order you do things, and what case you use to enter some of the details into the config screens.
My 2820vn is working just fine using MER and connected from WAN2 to the BT VDSL modem. I pre-configured WAN2 and the Sky modem only came out of the box to get hold of the MAC address and generate the login details, it hasn't actually been connected to the VDSL modem at all.
As you probably know the default user and password fields in the 2820 firmware are not long enough for the full DHCP 61 string to be stored, so the BETA firmware is essential before you start.
The trick is to get the MER settings to use the long login details correctly. Its not obvious at all because they are on a different page.
Get the MAC address of the Sky router and the user ID and password for it first then....
I followed these steps, the sequence is important, and it will require two re-boots to get it right:
1. Set the WAN2 to enable PPPoE
2. Specify the SKY router's MAC address in the PPPOE page, bottom right. Upper case works fine in here.
3. Enter the Sky username in the Username field. Use "<lowercase_mac_address>@skydsl" e.g. "4c17eb549e2c@skydsl"
4. Enter the Sky generated password in the PPPoE screen Password field, keep the case as it was generated by the generator tool, use cut and paste if you can to avoid spelling errors.
5. Save the settings and reboot the router. It will not connect this time around - don't worry at this point.
6. Change the WAN2 mode to enable "Static or Dynamic IP". Note: Even though PPPoE has been disabled the username settings are still saved and will be used.
7. Ensure that "Obtain an IP address automatically" is ticked.
8 Ensure that the Sky router's MAC address is Specified in the bottom right. Upper case works fine in here.
9 Select WAN detection mode as "ARP Detect"
10 Set MTU to 1442 (matched my Sky router)
11. Click OK and Reboot the 2820 if it doesn't prompt you for a re-boot.
On this re-boot the Router will send "username|password" as option 61 in any DHCP request. The string is coverted automatically into hex. The Sky MER DHCP server will respond because it has a valid request and you will be up and running.
You needed the "Obtain an IP address automatically" and "ARP Detect" to get the DHCP sequence triggered, and the PPPoE Username and password cached to pass it on the DHCP request. The firmware interface is not helpful, but it does work when you know the correct sequence to use when driving it.
I've been running this way for a couple of months now, getting 37.5m down and 8.1m up.
The one configuration downside is that you will lose the WAN2 failover to USB modem support because WAN1 and WAN2 are not simply logical assignments, they have very different meanings to the firmware.
Good luck
