I've had many of the problems mentioned here in the forums but this was a new one for me.
DGL-4500 A1 1.21 Beta 3 - wired connection failed (No WAN, 4 LAN ports fail) but wireless continued to work.
I've been traveling for business so I've been rebooting the router periodically so that if I'm gone for a couple weeks, it won't lock up while I'm gone. Uptime before the failure was about 26 days.
I updated (over the wireless connection) to DGL4500A2_FW121NAB08Beta as rebooting the router did not seem to fix the problem. I was on the phone with my cable ISP and the tech reported he could see momentary data flow as the 4500 rebooted. So the WAN port came up at some point during the boot process but then failed?
The 4 LAN ports failed - it wasn't 4 ethernet cables failing simultaneously, there was no connection, no work, nada
After the update to the latest beta firmware, the router is back up and running... for now....
Please fix the issues with this router before it finds itself in a shallow grave in the desert!
PLEASE, DLINK, fix it!