"ifconfig" - Trace Routes to Remote Host

Linux Tutorials - Herong's Tutorial Examples

∟"ifconfig" - Trace Routes to Remote Host

This section provides a tutorial example on how to use 'ifconfig' command to view and manage network interface configurations.

"ifconfig" is a command line tool that allows you to manage network interface configurations. Here are some examples on using the "ifconfig" command:

Display the current configuration of all network interfaces on my macOS computer:

herong$ ifconfig

eno1: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
    inet 192.168.1.3  netmask 255.255.255.0  broadcast 192.168.1.255
    inet6 fe80::544a:****:****:****  prefixlen 64  scopeid 0x20<link>
    ether **:**:**:**:**:**  txqueuelen 1000  (Ethernet)
    RX packets 358283201  bytes 404511320097 (376.7 GiB)
    RX errors 0  dropped 9353582  overruns 0  frame 0
    TX packets 387050825  bytes 490915453990 (457.2 GiB)
    TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
    device interrupt 20  memory 0xf7c00000-f7c20000

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
    inet 127.0.0.1  netmask 255.0.0.0
    inet6 ::1  prefixlen 128  scopeid 0x10<host>
    loop  txqueuelen 1000  (Local Loopback)
    RX packets 72185509  bytes 358471493733 (333.8 GiB)
    RX errors 0  dropped 0  overruns 0  frame 0
    TX packets 72185509  bytes 358471493733 (333.8 GiB)
    TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

virbr0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
    inet 192.168.122.1  netmask 255.255.255.0  broadcast 192.168.122.255
    ether 52:54:00:49:e8:8d  txqueuelen 1000  (Ethernet)
    RX packets 0  bytes 0 (0.0 B)
    RX errors 0  dropped 0  overruns 0  frame 0
    TX packets 0  bytes 0 (0.0 B)
    TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

What I can see from the output:

eno1 represents the onboard Ethernet cable socket.
lo0 represents the standard loopback interface.
virbr0 represents the virtual bridge for virtual machines.

You can also add custom bridge interfaces and remove them:

# adding a bridge between en1 and en2
sudo ifconfig bridge1 create
sudo ifconfig bridge1 addm en1 addm en2

# removing the bridge
sudo ifconfig bridge1 deletem en1 deletem en2
sudo ifconfig bridge1 down
sudo ifconfig bridge1 destroy