OStatic

By Randy Clark on Oct. 31, 2009

In Ubuntu 9, you can convert from a DHCP dynamic IP address to a static IP address as follows: (Remember, you will need to use sudo to do this!)

1) sudo vi /etc/network/interfaces

For your primary ethernet interface (usually eth0), you will see the following:

auto eth0

iface eth0 inet dhcp

You will need to remove the dhcp and add the following (assuming static IP address is 192.168.1.100):

iface eth0 inet statc

address 192.168.1.100

network 192.168.1.0

netmask 255.255.255.0

broadcast 192.168.1.255

gateway 192.168.1.1

Of course, you will need to put in your values for the IP address.

Next, you will need to set your nameserver in /etc/resolv.conf

>>> sudo vi /etc/resolv.conf

nameserver X.X.X.X

Replace the "X.X.X.X" with your name server from your service provider.

You will also need to remove your DHCP client, though in my boxes, these are not installed.

>>> sudo apt-get remove dhcp-client

Note - this may also be dhcp-client3

Hope this helps.

By George Murphy on Oct. 31, 2009

Do not forget to restart the network! You can, of course, restart your server, but you can run "/etc/init.d/networking restart" to do the trick.

Run ifconfig to check your new IP and then wget www.yahoo.com or ping it to make sure everything is in order.