Have you tried a different computer on that Ethernet connection?
Ethernet cables are cheap, low tech, flimsy, easily damaged, but highly critical network devices. Try a different cable.
Ethernet ports on routers/switches are not very robust either. I have seen several fail. So when swapping cables, try a different port too.
Note that factory made cables are rarely ever (if ever) tested before they leave the factory. They also rarely ever come in the length you actually need. For those reasons, I always make my own cables. In this way, if I need a 17 foot cable, I can make one instead of buying a 25 foot cable and stuffing the rest into a rat's nest/tripping hazard. Or if I need a 17 inch cable between my modem and router, I can make one.
A couple tips:
1. "Invest" in a quality crimper. Cheep tools yield poor results. I wasted $50 on two cheap crimpers I had to throw away before I finally got some common sense and bought a quality pair. The one I have now I've had for nearly 20 years and used on 100s of cables - with never a bad crimp.
2. Get an
Ethernet cable tester. These are inexpensive but invaluable at preventing and lowering high blood pressure, reducing strokes, and stopping, or at least slowing down receding hairlines and hair loss. A good 2-part tester is essential when pulling cable through barriers (walls/floors/ceilings) when terminating (attaching connector) is not done until after the cable is strung through the barrier.
3. Crimping cables is actually a skill. And like all skills, take practice to perfect. So be ready to sacrifice a few connectors on a few practice cables before you make the cables you will ultimately use. TIP: Good lighting is a must. The older the eyes, the brighter the light needs to be.
4. Nice to have:
Ethernet cable color-coded strain relief boots. As I said above, Ethernet cables and connectors are flimsy and fragile. So using strain relief boots to make them more robust and survivable is smart - if not a must. But having color-coded boots is really nice for easy identification (especially on the back of routers and switches) without having to deal with labels (and the tedious/PITA task of relabeling). The tricky part is just getting into the habit of slipping the boot on the cable (and in the right direction
) BEFORE crimping the connector on. You can always go with colored Ethernet cable, but basic gray in bulk is much cheaper.
I am assuming your NIC is integrated into your computer's motherboard. They can fail. If replacing the cable and swapping ports does not resolve this issue, you may simply need to replace your integrated NIC with a
card.
