The lan ports on my rt-n66u only work when the router is in rescue mode.
When in rescue mode I get ttl=100 and I can upload the firmware.
After its flashed my pings say "destination unreadable".
Here is my system log. Maybe someone can figure out why?
What firmware and what mode is your RT-N66U running in? What do you see under the Tools->Sysinfo Network section? Have you tried reseting to factory defaults as well and setting things up from scratch?
It is setup in wireless router mode.
In the network section it shows lan 1, which I'm connected to, as 10 half duplex.
I've reset it more than once, even did an nvram erase in the cfe.
I'm using a good cable.
I just unplugged the lan cable and the reading for the lan 1 still says 10 half duplex.
I guess it's hardware damage.