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How to connect to Wired internet connection through terminal?

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I am using Ubuntu 10.04 with KDE on it.
I am facing a problem in connecting to wired LAN internet connection.
Can any one tell me the procedure on how to connect to wired LAN internet connection through terminal..
I want to connect to wired internet connection with static IP and authentication.

3 Answers

How to configure the network interface using the terminal
You can configure a network interface from the command line using the networking utilities. You configure your network client hosts with the command line by using commands to change your current settings or by editing a number of system files. To configure your network interface card to automatically connect when wired cable is connected you can follow this "simple" steps:
  1. Configuring DHCP address for your network card
    To configure DHCP address, edit the /etc/network/interfaces and enter the following lines replacing eth0 in the example with your network interface card:
    sudo nano /etc/network/interfaces
    You should see something similar to this:
    auto eth0  
    iface eth0 inet dhcp
    in my computer it looks like this:
    auto lo  
    iface lo inet loopback
    So if your network card appears as eth2 for example then you would leave the file like this:
    auto eth2  
    iface eth2 inet dhcp
  2. Just in case you want to configure a static IP address for your network card
    Same procedure as above but you would need to include more information.
    Like above, replace eth0 with your networks card name:
    sudo nano /etc/network/interfaces
    Example File:
    auto eth0  
    iface eth0 inet static  
    After entering all the details which are needed for your static IP you would need to restart networking services using the following command:
    sudo /etc/init.d/networking restart
  3. Setting up DNS
    You can add hostname and/or IP addresses to the file /etc/hosts for static lookups.
    To cause your machine to consult with a particular server for name lookups you simply add their addresses to /etc/resolv.conf.
    For example a machine which should perform lookups from the DNS server at IP address would have a resolv.conf file looking like this:
    sudo nano /etc/resolv.conf
    in my case it looks like this:
most answers on this issue are most likely to confuse readers when demostrating what to put in the /etc/resolv.conf because they use local addresses for the nameserver.
"For example a machine which should perform lookups from the DNS server."
Here DNS server and nameserver mean the same thing. So instead of placing a LAN address in there, put an actual DNS server address. (ie. Google DNS server)
this link explains the used of the resolv.conf file in more depth.

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