I've just moved from a 21CN ADSL connection where I could achieve a download speed of around 10Mbps using the 2820n on WAN1 to a fibre service through WAN 2.

Now on my new fibre connection my IP profile is 54.72Mbps and connecting a laptop to the BT Openreach VDSL modem via PPPOE I get a download speed of 49.84Mbps.



When I connect the 2820n to the modem via WAN 2 it connects OK but my download speed is now only 19.78Mbps (uploads seem to be about the same)



The tests were carried out within a 30 minute period. I also have WAN 1 disabled. Can anyone tell me why my download speed is below half when connected through the 2820? If this is a configuration issue can anyone suggest what setting is throttling my download speed?

I'm on FW 3.3.5.2_232201

Thanks for any help or suggestions.

Model Name : Vigor2820Vn
Firmware Version : 3.3.7_232201
Build Date/Time : Oct 27 2011 11:20:43
ADSL Firmware Version : 232201_A Hardware: Annex A

Is what I use and the settings.

WAN > General setup
Enable : yes
Name: FTTC
Physical Mode : Ethernet
Physical type: 100M full duplex
Active mode always on

WAN > Internet Access > WAN 2

PPoE Enable
MTU 1442
ARP detect
PPP Pap or CHAP
idle -1
Default Mac
Dynamic IP (even though we have a static)


Make sure Quality of Service is disabled (inactive)

Hope this hepls

And it this doesn't work I know what will.

You need to start afresh with your setup. e.g. don't backup your config, you manually type it all in again after doing a firmware update. My speeds had exactly the same issue as you. I didn't believe that copying all my settings down on a pad, flashing the firmware to the latest (or to the one I'm using) and then manually typing them all in again would make any difference, but it did!

I thought I'd put my setting up first, just in case that fixes this, as it took me 2 hours to write everything down and then manually put in again. I suppose screen shots would have been better but I'd already started!

Regards