Is there a command that I can verify by its output the speed of my NIC and some information about its characteristics such as duplex full or half .
Suppose your NIC name
You can verify the speed and some informations by three Commands :
First Command :
dmesg |grep eth0
Second Command :
mii-tool -v eth0
FD : full duplex , Logic that enables concurrent sending and receiving. This is usually desirable and enabled when your computer is connected to a switch.
HD : half duplex , his logic requires a card to only send or receive at a single point of time. When your machine is connected to a Hub, it auto-negotiates itself and uses half duplex to avoid collisions.
Third command :
ethtool eth0 ethtool - Display or change ethernet card settings
Install ethtool :
sudo apt-get install ethtool
Settings for eth0: Supported ports: [ TP ] Supported link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full 1000baseT/Full Supported pause frame use: No Supports auto-negotiation: Yes Advertised link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full 1000baseT/Full Advertised pause frame use: No Advertised auto-negotiation: Yes Speed: 1000Mb/s Duplex: Full Port: Twisted Pair PHYAD: 0 Transceiver: internal Auto-negotiation: on MDI-X: Unknown Supports Wake-on: d Wake-on: d Current message level: 0x00000007 (7) drv probe link Link detected: yes
Hope it helps .
To obtain the link speed of an interface without parsing logs or installing additional tools, simply read its corresponding speed sysfs node, as follows:
where is the name of your NIC, e.g. eth0