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Configuring a network interface

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Ubuntu has GUI management of networking (settings -> network settings) and manually restarting /etc/init.d/networking is now deprecated, but still works in 12.04. The system overwrites some of the manual settings, for example /etc/resolv.conf, at reboot. One way around this is to put it all in the /etc/network/interfaces file.

You'll need to edit  /etc/network/interfaces 

Note:  The addresses below are provided as an example only.  ECE-IT will provide the appropriate addresses when a formal request has been received.

Open a terminal window and proceed with the following: 

 sudo

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vi

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/etc/network/interfaces

## To configure a dynamic IP address
auto eth0
iface eth0 inet dhcp

## Or configure a static IP
 auto

auto lo

iface lo inet loopback

auto eth0

iface 

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eth0 inet static

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address 192.168.1.14
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gateway 192.168.1.1
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netmask 255.255.255.0
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network 192.168.1.0
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broadcast 192.168.1.255
For these settings to take effect you need to restart your networking services.   
 sudo /etc/init.d/networking restart
Setting up DNS
To cause your machine to consult with a particular server for name lookups you simply add their addresses to /etc/resolv.conf.  
 sudo vi /etc/resolv.conf
enter the following details  
 search ece.utexas.edu
 domain ece.utexas.edu
 nameserver 128.83.185.41 
 nameserver 128.83.185.40nameserver 128.83.185.40 128.83.185.41
search ece.utexas.edu
 
don't forget
sudo apt-get remove dhcp-client
 
and
vi /etc/NetworkManager/NetworkManager.conf
and make sure the “managed” line contains:
managed=false
Restart the networking service
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