"ifconfig" - Trace Routes to Remote Host

Ubuntu 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 Ubuntu computer:

herong$ ifconfig

enp0s25: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
  ether ******  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

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 378546  bytes 1490999618 (1.4 GB)
  RX errors 0  dropped 0  overruns 0  frame 0
  TX packets 378546  bytes 1490999618 (1.4 GB)
  TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

wlp3s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
  inet 10.0.0.2  netmask 255.255.255.0  broadcast 10.0.0.255
  inet6 2601:195:c287:95a0::a806  prefixlen 128  scopeid 0x0<global>
  inet6 fe80::3034:982:5ed:b867  prefixlen 64  scopeid 0x20<link>
  RX packets 8308009  bytes 4460288329 (4.4 GB)
  RX errors 0  dropped 0  overruns 0  frame 0
  TX packets 33485355  bytes 49450226819 (49.4 GB)
  TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

Here is what I can read from the output:

"enp0s25" represents the onboard Ethernet cable socket. It is not connected at this moment. So it does not an IP assigned yet.
"lo" represents the standard loopback interface. It is always connected to the special loopback network (127.*.*.*) with only one computer, my computer (127.0.0.1).
"wlp3s0" represents the Wi-Fi interface. It is connected to my home Wi-Fi network (10.0.0.*) and assigned an IP of 10.0.0.2.
The last 4 lines in the interface section report network packets received and transmitted since last reboot. Communication issues are also summarized in the output.