Configuration Network on Ubuntu

Configuring DHCP IP Address for your Network Card
               if you want to configure DHCP address you need to edit file configuration is

edit file configuration is
                   
                          #vi /etc/network/interfaces

# primary network interface is eth0 (Lan Card)
auto eth0
iface eth0 inet dhcp

Configuring Static IP Address for your Network Card
edit file configuration is
                   
                          #vi /etc/network/interfaces

# The primary network interface
auto eth0
iface eth0 inet static
address 172.16.0.110
gateway 172.16.0.1
netmask 255.255.255.0
network 172.16.0.0
broadcast 172.16.0.255

After entering all the detail you need to restart networking services using the following command
                                # /etc/init.d/networking restart

Setting up Second IP address or Virtual IP address in Ubuntu

edit file configuration is

                   

                          #vi /etc/network/interfaces

auto eth0:1
iface eth0:1 inet static
address 192.168.1.60
netmask 255.255.255.0
network x.x.x.x
broadcast x.x.x.x
gateway x.x.x.x

Setting up DNS

edit file configuration is

                   

                          #vi /etc/resolve.conf

nameserver 8.8.8.8
nameserver 8.8.4.4