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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 .

guntbert
  • 13,475
nux
  • 39,152

3 Answers3

62

Suppose your NIC name eth0 :

You can verify the speed and some informations by three Commands :

First Command :

dmesg |grep eth0

Output :

enter image description here

Second Command :

mii-tool -v  eth0

Output :

enter image description here

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

Output :

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 .

nux
  • 39,152
30

To obtain the link speed of an interface without parsing logs or installing additional tools, simply read its corresponding speed sysfs node, as follows:

cat /sys/class/net/<interface>/speed

where <interface> is the name of your NIC, e.g. eth0.

BeastOfCaerbannog
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SytS
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0

enter image description here

You can use NetSpeed Extension

NetSpeed is a GNOME shell extension that displays the sum of your download and upload speed in your gnome panel. Clicking on it displays the separate values in a drop-down.

You can download it from Ubuntu Software Store.

It is applicable only if you use the GNOME desktop environment.

Reference: https://itsfoss.com/network-speed-monitor-linux/

Deepam Gupta
  • 381