In Linux (Debian), set static IP addresses of Intranet and Internet NICs. Modify vim/etc/network/interfaces for a single Nic as follows: [plain] # This file describes the network interfaces available on your system # and how to activate them. for more information, see interfaces (5 ). authorization # The loopback network interface auto lo iface lo inet loopback # The primary network interface allow-hotplug eth0 # iface eth0 inet dhcp auto eth0 iface eth0 inet static address 192.168.1.108 netmask 255.255.255.0 gateway 192.168.1.1/ etc/resolv. add a [plain] nameserver 192.168.1.1 to the end of conf to restart the network service and make the change take effect/etc/init. d/networking restart www.2cto.com set the interfaces file [plain] # This file describes the network interfaces available on your system # and how to activate them. for more information, see interfaces (5 ). # The loopback network interface auto lo iface lo inet loopback # The primary network interface auto eth0 iface eth0 inet static address 210.13.108.55 netmask implements 255.255.240 network without broadcast #gateway upgrade # dns-* options are implemented by the resolvconf package, if installed dns-route 10.9.7.1 then your dns-search then whyonly.com then auto eth1 iface eth1 inet static address 10.9.7.68 netmask 255.255.255.0 broadcast Protocol gateway 10.9.7.1 up/sbin/ip route add 10.9.0.0/16 via 10.9.7.1 src 10.9.7.68 down/sbin/ip route del 10.9.0.0/16 via 10.9.7.1 src 10.9.7.68 resolv. conf file [java] search internal.whyonly.com whyonly.com nameserver 10.9.7.1 nameserver 210.22.70.3 nameserver 210.22.84.3