Commands for changing the port speed of optical modules in Linux

With ethtool, we can also change settings like speed, duplexity, and toggling auto-negotiation. It takes the device name (like swp1) as an argument. See man ethtool (8) for details. Not all. Optical t...

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Jul 10, 2026

ethtool: Display and modify Ethernet device settings

ethtool is a Linux command-line tool that allows you to view and change various parameters related to Ethernet devices. It supports

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Feb 08, 2026

Monitoring Interfaces and Transceivers with ethtool | Cumulus Linux 5.9

The ethtool command enables you to query or control the network driver and hardware settings and takes the device name, such as

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Dec 17, 2025

How to get the speed of a network card on the command line?

I am trying to see what the speed of some network cards on a remote server. Our reporting software says they are 10Mbps, but I am

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Jan 31, 2026

Using ethtool in Linux | Baeldung on Linux

In this tutorial, we''ve taken a look at the ethtool command-line tool in Linux. Particularly, we''ve looked at some of the

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May 02, 2026

Monitoring Interfaces and Transceivers Using ethtool

The output of ethtool swpXX shows the port settings stored in the kernel. The switchd process keeps the hardware and kernel in

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Dec 26, 2025

ethtool (8)

When set to auto, the module is transitioned by the host to high power mode when the first port using it is put administratively up and

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Jul 25, 2026

networking

I am trying to change the server uplink from 100Mb/s to 1000Mb/s ethtool eth0 output # ethtool eth0 Settings for eth0: Supported

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Jun 09, 2026

Chapter 33. Tuning the network performance

In high-speed networks with 40 Gbps and faster, certain default values of network adapter-related kernel settings can be a cause of

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Feb 17, 2026

Monitoring Interfaces and Transceivers with ethtool | Cumulus Linux 5.9

To see hardware capabilities and measurement information on the SFP or QSFP module in a particular port, use the ethtool -m

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Jul 12, 2026

A Complete Guide to iperf3 Network Throughput Testing

Iperf3 is a powerful open source tool for analyzing network performance and diagnosing issues. In this comprehensive guide, we''ll

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Sep 17, 2025

Useful Linux Commands

In the following table, ethX should be replaced with the actual interface name. The supported speeds listed by ethtool reflect the

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