Check Interface setting in Linux

Ethtool Command to check duplex setting of nic

ethtool eth0

ethtool eth0
Settings for eth0:
    Supported ports: [ TP MII ]
    Supported link modes:   10baseT/Half 10baseT/Full
                            100baseT/Half 100baseT/Full
                            1000baseT/Half 1000baseT/Full
    Supported pause frame use: No
    Supports auto-negotiation: Yes
    Advertised link modes:  10baseT/Half 10baseT/Full
                            100baseT/Half 100baseT/Full
                            1000baseT/Half 1000baseT/Full
    Advertised pause frame use: Symmetric Receive-only
    Advertised auto-negotiatethtool eth0
Settings for eth0:
    Supported ports: [ TP MII ]
    Supported link modes:   10baseT/Half 10baseT/Full
                            100baseT/Half 100baseT/Full
                            1000baseT/Half 1000baseT/Full
    Supported pause frame use: No
    Supports auto-negotiation: Yes
    Advertised link modes:  10baseT/Half 10baseT/Full
                            100baseT/Half 100baseT/Full
                            1000baseT/Half 1000baseT/Full
    Advertised pause frame use: Symmetric Receive-only
    Advertised auto-negotiation: Yes
    Link partner advertised link modes:  10baseT/Half 10baseT/Full
                                         100baseT/Half 100baseT/Full
    Link partner advertised pause frame use: Symmetric
    Link partner advertised auto-negotiation: Yes
    Speed: 100Mb/s
    Duplex: Full
    Port: MII
    PHYAD: 0
    Transceiver: internal
    Auto-negotiation: on
Cannot get wake-on-lan settings: Operation not permitted
    Current message level: 0x00000033 (51)
                   drv probe ifdown ifup
    Link detected: yes
ion: Yes
    Link partner advertised link modes:  10baseT/Half 10baseT/Full
                                         100baseT/Half 100baseT/Full
    Link partner advertised pause frame use: Symmetric
    Link partner advertised auto-negotiation: Yes
    Speed: 100Mb/s
    Duplex: Full
    Port: MII
    PHYAD: 0
    Transceiver: internal
    Auto-negotiation: on
Cannot get wake-on-lan settings: Operation not permitted
    Current message level: 0x00000033 (51)
                   drv probe ifdown ifup
    Link detected: yes


Change Duplex setting change force fully

mii-tool -F 100baseTx-FD eth0

Change autoneg


ethtool -s eth0 speed 100 autoneg off

nmcli Command 

 

 

 

nmcli connection

 

Above command will show all interface  status

 

 

 

check ip & interface status  Cli

 

nmcli dev show enp2s0  ( find result below)

 

 

GENERAL.DEVICE:                         enp2s0
GENERAL.TYPE:                             ethernet
GENERAL.HWADDR:                      50:E5:49:BC:6A:B0
GENERAL.MTU:                             1500
GENERAL.STATE:                          100 (connected)
GENERAL.CONNECTION:                     Wired connection 1
GENERAL.CON-PATH:                       /org/freedesktop/NetworkManager/ActiveConnection/0
WIRED-PROPERTIES.CARRIER:               on
IP4.ADDRESS[1]:                         192.168.1.10/24
              
IP4.GATEWAY:                             192.168.1.1
IP4.ROUTE[1]:                           dst = 169.254.0.0/16, nh = 0.0.0.0, mt = 1000
IP4.DNS[1]:                                 8.8.8.8
IP6.ADDRESS[1]:                         fe80::a1f0:bcb1:c611:4f3a/64
IP6.GATEWAY: