Checking Duplex

Owned by Kelli Higdon
Last updated: Mar 22, 2024
1 min read

 

To check the duplex status from the command line issue

 

mii-tool
This will return a result like
eth0: negotiated 100baseTx-FD, link ok

 

You can also issue mii-diag for more detailed information
Using the default interface 'eth0'.
Basic registers of MII PHY #32:  1000 796d 001c c912 0de1 c9e1 000d 2001.
The autonegotiated capability is 01e0.
The autonegotiated media type is 100baseTx-FD.
Basic mode control register 0x1000: Auto-negotiation enabled.
You have link beat, and everything is working OK.
Your link partner advertised c9e1: 100baseTx-FD 100baseTx 10baseT-FD 10baseT.
End of basic transceiver information.

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