Question Strange issue: network cable not detected by either router nor computer, but passes test

llorban · Wednesday at 9:24 PM

I have an unusual problem and wondered what the experts think here. I have a TP Link router, a 200 ft of cat8 cable, and a server with 4 ethernet connectors. When the server is turned on, and the cable is plugged in on both ends, neither the server nor the router can detect that the cable is plugged in. However, when using a network cable tester, everything seems fine and the tester indicates the cable as functional. Any tips on what could cause such an issue?

In2Photos · Wednesday at 10:06 PM

Is this a Windows machine? Do you see the 4 ports in both device manager and network adapters?

llorban · Wednesday at 10:45 PM

No OS installed yet but I can see all 4 ports using FreeBSD and Ubuntu installers.

ch33zw1z · 2024-10-03T04:41:16-0400

llorban said:
No OS installed yet but I can see all 4 ports using FreeBSD and Ubuntu installers.

Alright, so are the ports not working when Linux is up and running?

dave_the_nerd · 2024-10-03T08:55:59-0400

What kind of tester? It’s very rare but it is possible to have a bad cable/crimp that passes a simple continuity test but isn’t “good enough” for the computers to negotiate a connection. The expensive Fluke type testers do data integrity checks and stuff too, but your typical $20 cable tester is just checking continuity.

I’d also “test” the NICs by plugging a laptop into each port and seeing the link light comes on. Even if the OS isn’t configured to see/use the NIC that should still work. Then at least you know the hardware is probably fine.

Question Strange issue: network cable not detected by either router nor computer, but passes test

llorban

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