Wednesday, April 19, 2017
Change Ubuntu Server from DHCP to a Static IP Address
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
address 192.168.1.100
netmask 255.255.255.0
network 192.168.1.0
broadcast 192.168.1.255
gateway 192.168.1.1
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 xxx.xxx.xxx.xxx� 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 (thanks to Peter for noticing). 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 www.google.com. If you get a response, name resolution is working(unless of course if google is in your hosts file).
Really pretty simple.
Updated Thanks to Nickname007 in the comments for noting that I forgot the DNS entries in the guide.
