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I have a Realtek Gaming GbE Family Controller. I've just upgraded all cabling to Cat 6. I've set 1.0 Gbps Full Duplex in the Controller Properties (from Auto Negotiation), and I've got into my router and confirmed that it has a 1000Mbps connection. I downloaded the Realtek driver from the Realtek page. The speed still registers as 100 Mbps in the Ethernet Status dialog on Win 10.

Does anyone have any other ideas? I've looked at numerous forums (including this one) and can't find any other suggestions.

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    The speed that Windows displays has no effect on the actual connection. It’s just what the driver reports. If you can, do a speed test with another (wired) device on the local network.
    – Daniel B
    Feb 13, 2022 at 10:05
  • Quick test - does the NIC have lights on/near the socket? If so, green or orange? Also check the other end of the cable run for similar.
    – Tetsujin
    Feb 13, 2022 at 10:50
  • One light is green, one orange. It's plugged into a router, which only displays a single green light. It reports a 100Mbps connection on the web interface. I've just run LAN Speed Test (totusoft.com/lanspeed), and it reports writing 13.21, reading 92.61 (the target machine [linux] reports gigabit speed. Is this typical for a gigabit NIC?
    – Robert S
    Feb 13, 2022 at 11:34
  • Wait, why are you setting the speed/duplex setting manually? This almost always has negative results. Feb 13, 2022 at 11:57
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    Please don't put "solved" in the title. Instead post the solution as an answer and mark it as accepted. This will mark the question as resolved and will make the solution visible.
    – gronostaj
    Feb 14, 2022 at 10:38

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I fixed this by replacing the terminal leading into the PC with a keystone jack. The old skirting wall mount socketrequired you to strip each wire and screw it and was prone to errors.

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