Monday, March 5, 2012

Change Ubuntu Server from DHCP to a Static IP Address

If the Ubuntu Server installer has set your server to use DHCP, you will want to change it to a static IP address so that people can actually use it.
Changing this setting without a GUI will require some text editing, but that’s classic linux, right?
Let’s open up the /etc/network/interfaces file. I’m going to use vi, but you can choose a different editor

sudo vi /etc/network/interfaces
For the primary interface, which is usually eth0, you will see these lines:
auto eth0
iface eth0 inet dhcp
As you can see, it’s using DHCP right now. We are going to change dhcp to static, and then there are a number of options that should be added below it. Obviously you’d customize this to your network.
auto eth0
iface eth0 inet static

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Now we’ll need to add in the DNS settings by editing the resolv.conf file:
sudo vi /etc/resolv.conf
On the line ‘name server’ replace the x with the IP of your name server. (You can do ifconfig /all to find out what they are)
You need to also remove the dhcp client for this to stick. You might need to remove dhcp-client3 instead.

sudo apt-get remove dhcp-client
Now we’ll just need to restart the networking components:
sudo /etc/init.d/networking restart
Ping If you get a response, name resolution is working(unless of course if google is in your hosts file).
Really pretty simple.
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Keywords: Configurare conexiune internet, Linux, Static IP Address, Tutorial, Tutorials, Ubuntu server.

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