... Most linux distributions are starting to provide the iproute2 package,
because of the new redesigned network subsystem implemented in kernels 2.2 and
up. The old comands 'ifconfig' and 'route' are now been deprecated because of
their faulty and unexpected behaviour under these kernels...
ip addr add 192.168.0.123 dev eth0
ip link set eth0 up
ip route add default via 192.168.0.254