It's connected with CAT6 to my Cisco switch (SG500X-48) which is not PoE and MTU is set 1512. I tested the cable, and it's passed the test.
There is no issues communicating with it as long as the LED is green.
I did have an issue earlier, where it didn't register the fact it was connected via wire, and it was broadcasting SSID as an open AP. Here is the threat for that issue.
I was able to resolve it by removing static IP rebooting and setting it on a static IP again.
