How to set static ip

$ sudo nano /etc/network/interfaces (cat /etc/network/interfaces)

edit:
auto eth0
iface eth0 inet static
address 192.168.1.5
netmask 255.255.255.0
network 192.168.1.0
gateway 192.168.1.1

Ctrl+x
enter

$sudo nano /etc/resolv.conf

nameserver 202.188.0.133
nameserver 202.188.1.5

$/etc/init.d/networking restart

to check ipconfig
$cat /etc/network/interfaces