I've got a NetGear WNDR3700v2 and am having a heck of a time getting connected to my 3DS friends list. I called Nintendo and we tried basically everything - forwarding all the ports, turning off the SPI firewall, putting the 3DS in the DMZ, using a static IP, different DNS, all of these in combination, you name it. I'm using the latest firmware (36) and it's connected to a Motorola SB5101 cable modem, and my ISP is Shaw.
Anyone had any luck with a similar configuration?
The particularly weird thing is that I don't have any issues getting a connection in general, or connecting to the eShop - I just downloaded a game without any problem.