2018-11-15 15:00:14 +00:00
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---
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layout: page
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category-page: intermediate
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category-title: Intermediate commands
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tags: command IfConfig
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author: Matteo Omenetti
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title: IfConfig
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---
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<!-- Introduction -->
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<i> IfConfig </i> stands for "<b>I</b>nterface <b>C</b>onfiguration". It is used
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to configure, control, and query network interface parameters of your system. <br>
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If you try running this command with no arguments, it will simply display information
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about all network interfaces currently active. <br>
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{% highlight bash %}
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ifConfig
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{% endhighlight %}
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The output sill resembles something like this, of course it changes from machine
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to machine:
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<pre>
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en5: flags=8863 UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST mtu 1500
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ether ac:de:48:00:11:22
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inet6 fe80::aede:48ff:fe00:1122%en5 prefixlen 64 scopeid 0x8
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nd6 options=201 PERFORMNUD,DAD
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media: autoselect (100baseTX full-duplex)
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status: active
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ap1: flags=8802 BROADCAST,SIMPLEX,MULTICAST mtu 1500
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ether f2:18:98:41:74:42
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media: autoselect
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status: inactive
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...
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</pre>
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<!-- End of Introduction -->
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If you want to view the configuration of all network interfaces, not just the ones currently active, you can use
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flag <code>a</code>.
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{% highlight bash %}
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2018-11-15 15:10:43 +00:00
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ifConfig -a
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2018-11-15 15:00:14 +00:00
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{% endhighlight %}
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If you want to view the configuration of a specific interface, you can specify the name of the interface
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you want to view after the command <i>IfConfig</i>:
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{% highlight bash %}
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ifConfig ap1
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{% endhighlight %}
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This command will show only the configuration of ap1.
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To enable an interface, you can use the command ifConfig with the name of the interface
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you want to enable, followed by the key word <code>up</code>.
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However, enabling or disabling a device, is a privilege reserved for the super user, therefore you also
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have to use the command <code>sudo</code>.
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{% highlight bash %}
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sudo ifConfig ap1 up
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{% endhighlight %}
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To disable an interface, you can follow the same procedure, this time using the key word <code>down</code>.
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{% highlight bash %}
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sudo ifConfig ap1 down
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{% endhighlight %}
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