Configure a static IP

Edit the section of the file /etc/network/interfaces that configures the wired interface to look like this:

# Wired or wireless interfaces
auto eth0
#iface eth0 inet dhcp
iface eth0 inet static
        address 192.168.2.2
        netmask 255.255.255.0
        gateway 192.168.2.1
        dns-nameservers 8.8.8.8

The dns-nameservers entry is optional.