/etc/network/interfaces

auto eth0
iface eth0 inet static
    hwaddress ether 00:11:22:33:44:55  # adres MAC - opcjonalnie
    address 192.168.0.100
    netmask 255.255.255.0
    gateway 192.168.0.1
    dns-nameservers 8.8.8.8 8.8.4.4