How to Know if Mac NIC is Dead or Dying
The test for this is pretty easy.
Test ping to addresses on your local subnet. Faulty hardware will fail locally as well as remotely.
Routing failures will only affect pings off the subnet.
I set up two things when this happens:
- ping your gateway
- Set up a point to point connection and ping another device.
Failing hardware is very rare, but once you see it you can certainly catch it with the right mousetrap.