tutorial - Network Configuration in Ubuntu

1) Configure your card for getting ip address from DHCP

sudo vi /etc/network/interfaces

auto eth0
iface eth0 inet dhcp

2) Configure your card for static ip address

sudo vi /etc/network/interfaces

auto eth0
iface eth0 inet static
address 192.168.0.1
gateway 192.168.0.2
netmask 255.255.255.0
network 192.168.0.0

After entering all the details you need to restart networking services using the following command

sudo /etc/init.d/networking restart

3) Setting up DNS server

sudo vi /etc/resolv.conf

search localhost
nameserver 192.168.0.2


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source:http://linuxpoison.blogspot.com/2008/07/135781758017366.html