For configuring static IP address in Debian edit /etc/network/interfaces file
sudo nano /etc/network/interfaces
Add following lines
auto eth0
iface eth0 inet static
address 192.168.0.2
netmask 255.255.255.0
gateway 192.168.0.1
dns-nameservers 192.168.0.1 8.8.8.8 8.8.4.4
