Over the past few days my ethernet-wired internet connection has started acting up. Here are some of the issues I've encountered:
- Websites are intermittently slow to load.
- Large downloads routinely fail halfway through.
- My SpeedTest results look like a roller coaster
- PingPlotter, WireShark (and just regular
ping) reports high packet loss/retransmission, seemingly all over place, including within our internal network.
- 30 Mbit Cable Internet
- Asus RT-N66U Gigabit Router
- TP-Link Gigabit switch
- MSI 970A-G46 Motherboard, with integrated Realtek 8111E NIC
- Windows 8.1 N Enterprise
Now here's where it starts to get interesting:
- This computer was built as part of a batch of 5 for our new office. All 5 have identical hardware, network topology, etc. and mine is the only one that seems to be acting up.
- I've tried swapping out ethernet cables, changing ports on the switch, bypassing the switch and plugging straight into the router, etc. Nothing fixes the issue.
- I've tried booting into Knoppix with a USB stick, and the issue persists.
- At no point and time does the Ethernet Adapter report being disconnected, it seems to believe it's functioning just fine.
All of this leads me to believe that it must be hardware problem with the motherboard's onboard NIC. But this is just a hunch on my part as I don't know of any way to actually confirm this.
Are there any diagnostic tools that can help me confirm where exactly the problem lies? Is it easy to prove (or disprove) my theory that it's the integrated NIC causing trouble?