Why does my Ethernet connection stop when I use full-duplex mode?
Why does my Ethernet connection stop when I use full-duplex mode?
I just finished setting up my new PC a few days ago. All drivers are installed and updated too as well as my BIOS settings. But when I use my ethernet connection at 1Gbps, Windows thinks I am plugging in and unplugging my LAN cable constantly. It connects and disconnects around 10 times every minute or more. If I force my speed and duplex setting to 100mbs half duplex it starts working normally. I've used the same cable with another PC and it worked fine at 1Gbps without any problem. Modem supports those speeds and my ISP is giving out 1000mbs up and download for sure since I've tried with my laptop and another desktop. Bought a new cable today to double check and same with both my CAT6 cables. I have an ASUS Rog Strix Z790-A motherboard and the Intel Ethernet Controller I226-V. I've thought of it being a driver issue but I can't find any older drivers for this ethernet controller. The one I have is driver version 1.1.3.28. So basically does anyone know what the problem might be and how to fix it?
You probably need to seriously worry about having bad ethernet cables. Speed negotiation happens at a hardware level and doesn't really rely on software drivers. So, if you have bad cables, a broken port in your router, or a faulty port on the computer, you'll likely be in trouble. Honestly, just because an Ethernet cable works in other people's machines doesn't mean it will work for you. Some marginal cables might function fine with one device but fail with another. Also, ports that are 2.5 gigahertz (2.5g) are very sensitive to bad or incorrect cables. A huge issue right now is the flood of fake ethernet cables on Amazon. Most of them look like flat cables where the wire is too small to meet the official certification standards for an Ethernet cable. All you really need are Cat 5e pure copper cables with a wire size between 22 AWG and 24 AWG.
Maybe your internet connection is shaky. Try swapping out the cable for a new one. If that doesn't work, you can try sticking some electrical tape around the RJ45 plug to give it more room. I have a laptop that has this exact problem with my ethernet port. I did okay because I used the same trick: wrapping an electrical tape around the connector of the cable.
Are you saying you should use electrical tape around the edges of the plug so it sits perfectly in the center hole?
The new cable didn't fix it, but I used a cheap USB-C-to-ethernet thing to get speed back up to gigahertz levels. It's working now. Just taped things earlier didn't help much anyway. For now, this is good enough for me.
Although you likely will find nothing I would inspect the lan port and see if there is anything that looks bent or maybe there is some dirt or something in the port. The ethernet ports though do actually fail it is just very rare. Since it is a 790 board it has to still be under warranty but RMA is such a pain.
The port looks great, just like every other one I have looked at before. For right now I am glad it is that way.