To change the IP address on Linux manually, do the following:
$ sudo vi /etc/network/interfaces
You should see something like this:
auto eth0
iface eth0 inet dhcp
Change it to this:
auto etho
iface eth0 inet static
address 192.168.1.00
netmask 255.255.255.0
gateway 192.168.1.1
replacing the IP addresses with your network addresses....
To change the DNS settings, do the following:
$ sudo vi /etc/resolv.conf
add the DNS servers IP address that you want to use
When you are done make sure you restart the networking components:
$ sudo /etc/init.d/networking restart