The same problem.
Some day LAN card on D510MO changed ethernet address
It's fallen to plant settings. F.e. it was e0:cb:11:22:33:44, now it is e0:cb:00:00:00:00.
How can I fix this problem and restore ethernet address - I dont know.
Please help who knows how to fix the problem.
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In my case I found that the D510MO lan port could not drive a
long ethernet cable. I had to put a cheap 8-port switch in between
and connect the D510MO to the switch by a 1.5 meter cable.