Ubuntu configure network

http://www.ubuntugeek.com/ubuntu-networking-configuration-using-command-line.html

Configs are here:

/etc/network/interfaces

DHCP

auto eth0
iface eth0 inet dhcp

Static

auto eth0
iface eth0 inet static
address 192.168.7.101
gateway 192.168.7.1
netmask 255.255.255.0
network 192.168.7.0
broadcast 192.168.7.255

Static second IP on the same interface

auto eth0:1
iface eth0:1 inet static
address 192.168.7.102
gateway 192.168.7.1
netmask 255.255.255.0
network 192.168.7.0
broadcast 192.168.7.255

Apply settings

sudo /etc/init.d/networking restart

Hostname

sudo /bin/hostname newname

DNS

sudo nano /etc/resolv.conf

in config:

search example.com
nameserver 192.168.7.1