Edit /etc/network/interfaces, and do it like this below: Make sure, you have all interfaces listed and automatically started:
auto lo eth0 eth1 iface lo inet loopbackFirst uncomment the DHCP, if it was active for eth0:
# The primary network interface #auto eth0 #iface eth0 inet dhcpNow you can enter the fixed values for eth0:
#custom iface eth0 inet static address 10.1.1.233 netmask 255.255.255.0 network 10.1.1.0 broadcast 10.1.1.255 gateway 10.1.1.254If you have more interfaces, type all in as abowe.
iface eth1 inet static address 80.xx.xx.xx netmask 255.255.255.0 broadcast 80.xx.xx.254 network 80.xx.xx.0