/etc/init.d/networking restart
Reconfiguring network interfaces... cat: can't open '/var/run/udhcpc.eth0.pid': No such file or directory
ifconfig: SIOCGIFFLAGS: No such device
cat: can't open '/var/run/udhcpc.usb0.pid': No such file or directory
ifconfig: SIOCGIFFLAGS: No such device
ifconfig: SIOCGIFFLAGS: No such device
ifconfig: SIOCGIFFLAGS: No such device
eth0      No such device

ifconfig: SIOCGIFFLAGS: No such device
ifconfig: SIOCGIFFLAGS: No such device
ifconfig: SIOCGIFFLAGS: No such device
usb0      No such device

ifconfig: SIOCGIFFLAGS: No such device
done.
root@beagleboard:/# cat eth
cat: can't open 'eth': No such file or directory