Please be aware that this command only shows what the onboard NIC is actually set to run at. The true speed and duplex limits depend on what your server is assigned to at the switch or router level.
How to check the port speed and duplex setting (Linux)?
Sometimes it is necessary to verify the port speed and the duplex settings on your Linux server. The following tutorial shows you how.
To verify the port speed and duplex setting on a Linux do the following:
Login to your server via SSH and switch to the root user account. Then initiate the following command:
The output above shows 10Mbps (10) and Full Duplex (FD).
Copyright 2006 – Webhostingresourcekit.com