One of the PCs on my lan gets slow download speeds on lan and WiFi. Both speeds appear to cap around 5mb. Other systems on the WiFi are hitting 20+ mb. I expected the download on Ethernet to be better but was shocked both were yielding the same results. WiFi is through a TP Link 1300 pci card. Ethernet Is through the on boa d Realtek adapter in MSI b450 gaming plus max. Drivers for both devices have been updated. Any suggestions on what could cause this?
Bad cable most likely.
Are other devices working fine?
I would be very suspicious about that. I would verify that WiFi was completely disabled, because I would suspect it the PC is still using the WiFi connection for some reason.
Even very slow Ethernet should be 10 Mbps at minimum. In order to get 5 it would need to be half-duplex with lots of packet collisions. Or transmit errors I suppose, which would result from a bad cable.
The other possibility is that what you think is Ethernet is going through a WiFi bridge. I do that here actually, for one group of devices that is hard to get a cable to.
Do a speed test with the PC connected with Ethernet directly to the Internet router just to isolate the problem. If that works then follow the problem backward, testing the cables, switches, interface ports, etc, until you find the problem.
It would drop down to 5 if his cable went bad and the settings got switched from Full Duplex to Half Duplex.
This guy knows ^
also like he said disable your Wi-Fi interface
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I doubt it did switch to 10/100mb networking, but aren’t they both half duplex anyway? Didn’t full duplex only get widely adopted with gigabit?
The wifi sounds more likely though.
10 Mbps over twisted pair 10Base-T, is the first that allowed for full duplex.
1000Base-T is the first that made all 4 pairs(8wires) mandatory, and also made mdi/mdi-x autodetection mandatory (e.g. cross over or straight or 586A or 586B cables don’t matter for gigabit).