Editing Ifconfig

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<code>[[wikipedia:ifconfig|ifconfig]]</code>is a command in Unix-like operating systems like Linux<ref>https://linux.die.net/man/8/ifconfig</ref>, [[FreeBSD]], [[OpenBSD]], [[macOS]] for [[Ethernet]] network interface configuration.


In [[macOS]], the <code>ifconfig</code> command functions as a [[Wrapper pattern|wrapper]] to the IPConfiguration agent, and can control the [[BootP]] and [[DHCP]] clients from the command-line. Use of <code>ifconfig</code> to modify network settings in Mac OS X is discouraged, because <code>ifconfig</code> 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 <code>/usr/sbin/ipconfig</code> or <code>/usr/sbin/[[macOS/networksetup|networksetup]]</code>.

<code>ifconfig</code> command is included in the <code>[[net-tools]]</code> package but not installed by default in RHEL since version 7<ref>https://lwn.net/Articles/710533</ref>.

== Configuring an alias IP ==
=== Linux alias ===
 ifconfig [[eth]]0''':0''' 192.168.1.6 up

 ifconfig eth0:0
 eth0:0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
         inet 192.168.1.6  netmask 255.255.255.0  broadcast 192.168.1.255
         ether 33:54:00:7d:35:22  txqueuelen 1000  (Ethernet)

=== [[macOS]] [[alias]] ===
Configure 3 alias in <code>en1</code> interface, https://ss64.com/osx/ifconfig.html:
<pre>
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
</pre>
or
<pre>
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
</pre>


Remove/delete alias: 
 sudo ifconfig en1 inet 192.168.10.2/24 delete



 ifconfig eth# up or [[ip link]] set eth0 up

== Activities ==
* Show interface configuration in Linux including ip addresses: <code>[[ifconfig -a]]</code> or <code>[[ip a]]</code>
* Show interface Ethernet network capabilities of your interface, such as speed, with: <code>mii-tool -v YOUR_INTERFACE_NAME</code>,  <code>mii-tool -v eth0</code>
* [[Show all network interfaces in Linux]]:<ref>https://www.cyberciti.biz/faq/linux-list-network-cards-command/</ref>
* Learn about [https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/networking_guide/ch-consistent_network_device_naming Linux Naming Schemes Hierarchy].

* Change your [[MAC]] address: <code>ifconfig {eth0|wlan0} hw ether CA:CA:CA:CA:CA:CA</code>
* [[macOS]]: <code>[[ipconfig getifaddr]] en0</code>

== Related ==
* <code>[[ifconfig -v]]</code>
* <code>[[docker inspect]] CONTAINER_NAME | grep IPAddress</code>
* Linux: <code>[[hostname -I]]</code>, <code>[[hostname -i]]</code>
 anpi0 anpi1 anpi2 ap1 awdl0 bridge0 en0 en1 en2 en3 en4 en5 en6 gif0 llw0 lo0 stf0 utun0 utun1 utun2 utun3

== See also ==
* {{Linux networking}}
* <code>[[ipconfig]]</code> Windows command
* {{MacOS networking}}
* [[bonding]]

== References ==

{{CC license}}
Source: https://en.wikiversity.org/wiki/Ifconfig

[[Category:Linux]]
[[Category:Operating Systems]]
[[Category:Computer Networks]]