Can't ifdown eth0 (main interface)

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http://unix.stackexchange.com – I can't ifdown an interface on a Debian 6.0.5 box; user@box:/etc/network$ sudo ifdown eth0 && sudo ifup eth0 ifdown: interface eth0 not configured SIOCADDRT: File exists Failed to bring up eth0. user@box:/etc/network$ cat interfaces auto lo iface lo inet loopback allow-hotplug eth0 allow-hotplug eth1 auto eth0 iface eth0 inet static address netmask gateway auto eth1 iface eth1 inet manual I'm stumped. Any help would be greatly appreciated. Thank you. UPDATE As requested by marco; user@box:/etc/network/$ cat run/ifstate lo=lo eth1=eth1 (HowTos)