Ifconfig

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ifconfigis a command in Unix-like operating systems like Linux[1], FreeBSD, OpenBSD, macOS for Ethernet network interface configuration.


In macOS, the ifconfig command functions as a wrapper to the IPConfiguration agent, and can control the BootP and DHCP clients from the command-line. Use of ifconfig to modify network settings in Mac OS X is discouraged, because ifconfig operates below the level of the system frameworks which help manage network configuration. To change network settings in Mac OS X from the command line, use /usr/sbin/ipconfig or /usr/sbin/networksetup.

ifconfig command is included in the net-tools package but not installed by default in RHEL since version 7[2].

macOS alias[edit]

Configure 3 alias in en1 interface, https://ss64.com/osx/ifconfig.html:

sudo ifconfig en1 inet 192.168.10.2/24 add
sudo ifconfig en1 inet 192.168.20.2/24 add
sudo ifconfig en1 inet 192.168.30.2/24 add

or

sudo ifconfig en1 inet 192.168.10.2/24 alias
sudo ifconfig en1 inet 192.168.20.2/24 alias
sudo ifconfig en1 inet 192.168.30.2/24 alias

Activities[edit]

  • Show interface configuration in Linux including ip addresses: ifconfig -a or ip a
  • Show interface Ethernet network capabilities of your interface, such as speed, with: mii-tool -v YOUR_INTERFACE_NAME, mii-tool -v eth0
  • Show all network inferfaces in Linux:[3]
lspci | egrep -i --color 'network|ethernet'
lshw -class network
ifconfig -a
ip link show
ip a
cat /proc/net/dev
systemd/networkctl|networkctl list
nmcli|nmcli device show

See also[edit]

References[edit]

  1. https://linux.die.net/man/8/ifconfig
  2. https://lwn.net/Articles/710533
  3. https://www.cyberciti.biz/faq/linux-list-network-cards-command/