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How to find details about the network interface using the Linux Mii tool x8t4. Post How to , Linux. You may also like Read Full Post. Although a great rarity, you may have occasion to dictate to the Ethernet interface the speed at which it should talk to the switch or hub. Normally, two connected devices will negotiate the fastest possible commonly shared speed. You can select what speeds you want to support on an Ethernet interface by using mii-tool.
Specifying Ethernet port speeds with mii-tool --advertise. After we specified that we wished only to support 10baseT-HD and 10baseT-FD as acceptable speeds, mii-tool caused the Ethernet driver to renegotiate port speed with the attached device. Here we selected 10baseT-FD. Forcing Ethernet port speed with mii-tool --force. After manipulating the speed at which the Ethernet driver would communicate with the connected device on tristan , we chose to restart the autonegotiation process without forcing a particular speed or advertising a particular speed.
So, if you must know at what speed your linux machine is connected to another device, mii-tool comes to your rescue. That is BaseT4. This is probably not a concern for most recently upgraded network infrastructure. It then sets the duplex to half -duplex and the speed to the lowest allowed value. To avoid this, it is better to force switch port and server NIC at the same speed and duplex values, or auto-negotiate.
For Linux platforms, nothing is better than a perfectly compatible NIC card. Most of the Linux vendor's have a list of compatible hardware on their websites. Linux distributions automatically negotiate the speed and duplex of the NIC card with the switch to which it is connected.
As there are differences in the implementation of protocols, it is not sufficient to configure a switch port to auto-negotiate speed and duplex mode.
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