NIC Stopped Working for Multiple Operating Systems

Mar 10, 2018
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Note: I have resolved this failure. However, the eventual solution to the problem, in my opinion, makes absolutely no sense and so I am trying to figure out why the failure would have occurred in the first place.

First off, the system: Dual Boot Windows 10 / Linux Mint machine using Realtek Gigabit Onboard Lan (motherboard is a GA-990FX UD5 rev.1).

Okay, long story short: About two months ago I was playing some DOTA2. Lost the game (naturally), shut down my machine and went to bed for the night. Woke up the next morning, booted into Windows 10 and my wired internet connection wasn't working. After some light troubleshooting, I booted into Linux Mint. To my surprise, the internet connection wasn't working in Linux Mint either.

Figured it was the router (ASUS RT-AC3200), so I reset the router to factory defaults.

No dice.

Deleted Network profiles in Windows (via registry and Network Sharing Center).

Nope.

Tried using Kali Linux live USB. Same thing. Unable to connect. Performed additional and equivalent steps in Windows / Linux Mint (ipconfig /release. /renew. Static IP instead of DHCP, etc). Nothing worked.

Assumed the on-board NIC was just bad, gave up and switched to my wireless ALFA AWUS036ACH. Flash forward to today when I gave it another shot. Performed all previous steps (and then some). Duplicated efforts in Linux. NOTHING worked, until...

Uninstalled network card from Windows via Device Manager, then installed latest drivers. NIC now works in Windows AND in Linux.

Why would this occur?

Sidenote: When I went to uninstall the device from Device Manager, it didn't give me the radio button to delete the drivers from the system entirely. As I mentioned, I just installed the latest drivers provided by Gigabyte's homepage once I removed the device.
 
Apr 6, 2018
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World in general, many variables to a problem and we try to narrow it down, but the truth is, the doctor often doesn't know exactly why a certain pill works on you, he just says try this, try that, a-ha! It works, be glad, move on.

In 20 years I've bumped into 2 instances of duplicated MAC which we've been told is impossible, so what ya gonna do? throw what puppy away and stick another NIC in there.