Change Ethernet adapter speed from 100.0 Mbps to 1.0 Gbps

Question

The stock NIC on my MSI Big Bang Xpower is a Realtek PCIe GBE RTL8111DL adapter. The NIC is reporting a speed of 100.0 Mbps, but the manufacturer's website says it is a Gigabit controller.

I read the NIC will auto negotiate the connection speed to the highest availalbe. I have it connected to a D-Link 5 port DGS 2205, which is a Gigabit device. Since both devices are Gigabit, I would expect the NIC to connect using a Gigabit speed.

I have another computer connected to this switch, and that comptuer is reporting 1.0 Gbps. So I suspect a configuration problem with the first computer's NIC. All connections use Cat5e cable.

How can I configure this Gigabit NIC to connect at speeds of 1.0 Gbps?

Solution

You need to check the cables

• There are cables and cables. Since you have two, switch them between the machines and see what happens
• Sometimes there are problems with the cables not being plugged in properly (esp. if the "hook" doesn't work or is missing). While I'd expect no connection, check this anyway.

Comments

[Chris Nava]

Try a different patch cord. The one you are using may be sub standard.

[Admin]

Check the cable, if you are using a Cat-5 cable it won't run at 1 Gbps.

[HikeMike]

Switch the cables around. Maybe the one you're using for this machine has a problem.

[HikeMike]

@JM. Glad that worked, and thanks for your offer.

[Teapod]

On newer LAN cards CAT5 cables works fine with Gigabit. On older LAN cards Gigabit worked only with CAT6 cables for us.

[steampowered]

This switch does gigabit on all 5 ports. In addition, switching ports with the computer which is connected at 1.0 Gbps has no effect. The driver on the NIC adapters is the latest driver.