b46207e079
git-svn-id: svn+ssh://atelier.inf.usi.ch/home/bevilj/group-1@261 a672b425-5310-4d7a-af5c-997e18724b81
70 lines
2.1 KiB
HTML
70 lines
2.1 KiB
HTML
---
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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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previous-page: pages/cmd/interm/htop.html
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next-page: pages/cmd/interm/install.html
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---
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The command <code>ifconfig</code> stands for <i>Interface CONFIGuration</i>. 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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If you want to view the configuration of all network interfaces, not just the ones
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currently active, you can use flag <code>a</code>.
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{% highlight bash %}
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ifconfig -a
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{% endhighlight %}
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If you want to view the configuration of a specific interface, you can specify
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the name of the interface 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.<br>
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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>.<br>
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However, enabling or disabling a device, is a privilege reserved for the super user,
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therefore you also 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
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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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