We have a DELL PowerEdge with two NICs. eth0 xx.xx.166.46 is an IP part of a class routed trough xx.xx.74.33 (a ZyXEL router). eth1 xx.xx.74.34 is directly connected to the ISP. Code: auto eth0 iface eth0 inet static address xx.xx.166.46 netmask 255.255.255.248 network xx.xx.166.40 broadcast xx.xx.166.47 gateway xx.xx.166.42 auto eth1 iface eth1 inet static address xx.xx.74.34 netmask 255.255.255.0 network xx.xx.74.0 broadcast xx.xx.74.255 gateway xx.xx.74.1 We can not up both interfaces because for some reason they can't work together. I'm sure this is yet another routing problem but help would be very appreciated.