How to change network card speed and duplex settings in ubuntu

[ Thanks to swetna
for this link. ]

“If you want to change speed and duplex of your network
card you have to use ethtool or mii-tool.

“ethtool can be used to query and change settings such as speed,
auto- negotiation and checksum offload on many network devices,
especially Ethernet devices.

“In ubuntu if you want to use mii-tool you have to install
net-tools package.

“Net-tools package includes the important tools for controlling
the network subsystem of the Linux kernel. This includes arp,
ifconfig, netstat, rarp, nameif and route. Additionally, this
package contains utilities relating to particular network hardware
types (plipconfig, slattach, mii-tool) and advanced aspects of IP
configuration (iptunnel, ipmaddr).”

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