Can Intel® Ethernet Server Adapter X520 Series Support Network Speed Change?

The Intel® Ethernet Server Adapter X520 Series network card supports 10/1GbE data rate per port. 

How do I change the speed of the network card in Linux*/CentOS*?

1. Find the name of the network interface card:
   • Run ifconfig from the command terminal.
2. After determining the device name, run the following command to check the current Speed, Auto-Negotiation, and Duplex mode:
   • ethtool devicename
3. You can use the ethtool –s command to change the current settings by defining the values for Speed, Duplex, and Autoneg:
   • sudo ethtool –s [device_name] speed [1000/10000] duplex [half/full] autoneg [on/off]

For example, to change the value of the Speed and Duplex to the following mode:

• Speed - 1000Mb/s
• Duplex mode - Full
• Auto negotiation - Off

Run the following command:

• sudo ethtool –s [device_name] speed 1000 duplex full autoneg off

ethtool is a Network Interface Card configuration command that allows you to retrieve information and change the Network Interface Card (NIC) settings.

These settings include Speed, Duplex, Auto-Negotiation, and many other parameters.