Router is a DIR-601 hardware B with firmware 2.00NA
Using the router connected to a cable modem, I was unable to gain admin access via WAN.
To troubleshoot the problem, I connected the router to the LAN side of my main router (DHCP server, DNS, etc.) The primary router correctly assigns a WAN IP to the 601. The 601 operates normally to access the Internet either via its WiFi or via Ethernet. The 601 is configured for a different IP address range on its LAN side so there is no IP address conflict possible with my main router.
On Tools->Administration, Enable Remote Management is checked, Remote Admin port is 1080 (I've tried others), and Remote Admin Inbound Filter is set to Allow.
In this case the WAN IP address of the router is 192.168.0.98. When I go to http://192.168.0.98:1080/ with a web browser from the WAN side, I get no response. From the same computer I can ping the router with "ping 192.168.0.98".
I figure I have to be missing something here. It appears that this feature just is not there, but others must have this working. It seems like I've tried every possible combination of filters, port numbers, etc., but it just doesn't respond from the WAN side. (192.168.1.1 on port 80 works just fine from the LAN side.)
I'd be interested in any advice folks may have. This is driving me nuts. I've never had this type of trouble with a router before.
Thanks!