Please help me change my link speed to 2.5Gbps. The Nic is connected to a 2.5Gbps switch that is confirmed working with other devices. Also the 2.5Gbps Nic is confirmed to connect at the correct link speed on Windows and Mac.
One important piece of information that’s still missing is what hardware ZimaOS is actually running on. The screenshot shows that ZimaOS is correctly reporting the negotiated link speed, but without knowing the server model and NIC chipset, it’s hard to determine why the link is settling at 1 Gbps in this case.
Even if the switch supports 2.5 GbE and other devices connect at 2.5 GbE, Ethernet negotiation is specific to the exact combination of device, NIC, driver, cable, and switch port. That’s why the same NIC can negotiate at 2.5 GbE on Windows or macOS, yet fall back to 1 Gbps on a Linux-based system depending on the hardware and driver involved.
To help narrow this down, could you please share:
- the server or device model running ZimaOS, and
- the NIC details (or the output of
ethtoolfor the active interface)?
That information will make it much easier to see whether this is a hardware, driver, or link-path issue rather than a ZimaOS problem.
Hello, thank you for the response and your help. Here is the info you requested.
The Nic uses a Realtek RTL8156B chip
Thank you for providing the additional information.
The NIC shown is a Realtek RTL8156B, which is a USB-based 2.5 GbE adapter. On older platforms, Linux-based systems such as ZimaOS may negotiate this type of adapter at 1 Gbps for stability, even when 2.5 GbE works on Windows or macOS using different drivers. This behaviour is not specific to ZimaOS.
For consistent 2.5 GbE operation on Linux, a native PCIe 2.5 GbE NIC (for example, Intel I225 or I226) is recommended.
Thank you for this info, I ordered an intel Nic; I will send an update once it is installed.
Could you please run the following commands on the device and share the full output with me (copy-paste is fine, screenshots are also OK)?
lshw -json -disable scsi -C network
I replaced the USB Nic with an intel pcie Nic, now everything is working correctly. thank you again for your help.
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