Interesting, it#s worth noting that the 2820 router only has 1GB port, the others are 10/100.
I'm a Draytek reseller and an avid user of them, and they are well priced units if you are looking for a high quality SMB space VPN router thingymabob.
I was working late last night when I needed access to one of these things, which I didn't program, deploy or mange. But I was able to access it within 5 minutes and reprogram it for my needs. Now this was only possible with LAN access so it is kind of secure I suppose.
Basically none of these routers are safe and are vulnerable to a draytek 'backdoor' which the manufacturer has programmed into the firmware.
I don't know whether to laugh, rejoice or cry at this news to be honest, but there you go.