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(tdn@homer.) (Sun Apr 01 10:38 ) {P:0 H:402}
(~) ifconfig
eth0      Link encap:Ethernet  HWaddr 00:10:A7:05:6D:D5
          inet addr:10.0.0.125  Bcast:10.0.0.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:100 errors:0 dropped:0 overruns:0 frame:0
          TX packets:80 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:12723 (12.4 KiB)  TX bytes:10360 (10.1 KiB)
          Interrupt:11 Base address:0x2000

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:37 errors:0 dropped:0 overruns:0 frame:0
          TX packets:37 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:19601 (19.1 KiB)  TX bytes:19601 (19.1 KiB)

(tdn@homer.) (Sun Apr 01 10:39 ) {P:0 H:403}
(~) cat /etc/network/interfaces
auto lo
iface lo inet loopback

auto eth0
iface eth0 inet dhcp

auto eth0:0
iface eth0:0 inet static
  address 10.0.0.50
  netmask 255.0.0.0
  network 10.0.0.0
  #gateway 10.0.0.254

auto eth1
iface eth1 inet dhcp

auto eth2
iface eth2 inet dhcp

auto ath0
iface ath0 inet dhcp

auto wlan0
iface wlan0 inet dhcp

(tdn@homer.) (Sun Apr 01 10:39 ) {P:0 H:405}
(~) sudo ifup eth0:0
ifup: interface eth0:0 already configured
(tdn@homer.) (Sun Apr 01 10:39 ) {P:0 H:406}
(~)

(tdn@homer.) (Sun Apr 01 10:40 ) {P:0 H:406}
(~) sudo ifdown eth0:0
SIOCSIFFLAGS: Cannot assign requested address

(tdn@homer.) (Sun Apr 01 10:40 ) {P:0 H:407}
(~) sudo ifup eth0:0
SIOCSIFFLAGS: Cannot assign requested address
(tdn@homer.) (Sun Apr 01 10:40 ) {P:0 H:408}
(~)


(tdn@homer.) (Sun Apr 01 10:40 ) {P:0 H:408}
(~) sudo /etc/init.d/networking restart
 * Reconfiguring network interfaces...
There is already a pid file /var/run/dhclient.eth0.pid with pid 4937
killed old client process, removed PID file
Internet Systems Consortium DHCP Client V3.0.4
Copyright 2004-2006 Internet Systems Consortium.
All rights reserved.
For info, please visit http://www.isc.org/sw/dhcp/

Listening on LPF/eth0/00:10:a7:05:6d:d5
Sending on   LPF/eth0/00:10:a7:05:6d:d5
Sending on   Socket/fallback
DHCPRELEASE on eth0 to 10.0.0.254 port 67
SIOCSIFFLAGS: Cannot assign requested address
There is already a pid file /var/run/dhclient.eth0.pid with pid 134993416
Internet Systems Consortium DHCP Client V3.0.4
Copyright 2004-2006 Internet Systems Consortium.
All rights reserved.
For info, please visit http://www.isc.org/sw/dhcp/

Listening on LPF/eth0/00:10:a7:05:6d:d5
Sending on   LPF/eth0/00:10:a7:05:6d:d5
Sending on   Socket/fallback
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 3
DHCPOFFER from 10.0.0.254
DHCPREQUEST on eth0 to 255.255.255.255 port 67
DHCPACK from 10.0.0.254
bound to 10.0.0.125 -- renewal in 22701 seconds.
SIOCSIFFLAGS: Cannot assign requested address
eth1: ERROR while getting interface flags: No such device
There is already a pid file /var/run/dhclient.eth1.pid with pid 134993416
Internet Systems Consortium DHCP Client V3.0.4
Copyright 2004-2006 Internet Systems Consortium.
All rights reserved.
For info, please visit http://www.isc.org/sw/dhcp/

SIOCSIFADDR: No such device
eth1: ERROR while getting interface flags: No such device
eth1: ERROR while getting interface flags: No such device
Bind socket to interface: No such device
Failed to bring up eth1.
eth2: ERROR while getting interface flags: No such device
There is already a pid file /var/run/dhclient.eth2.pid with pid 134993416
Internet Systems Consortium DHCP Client V3.0.4
Copyright 2004-2006 Internet Systems Consortium.
All rights reserved.
For info, please visit http://www.isc.org/sw/dhcp/

SIOCSIFADDR: No such device
eth2: ERROR while getting interface flags: No such device
eth2: ERROR while getting interface flags: No such device
Bind socket to interface: No such device
Failed to bring up eth2.
ath0: ERROR while getting interface flags: No such device
There is already a pid file /var/run/dhclient.ath0.pid with pid 134993416
Internet Systems Consortium DHCP Client V3.0.4
Copyright 2004-2006 Internet Systems Consortium.
All rights reserved.
For info, please visit http://www.isc.org/sw/dhcp/

SIOCSIFADDR: No such device
ath0: ERROR while getting interface flags: No such device
ath0: ERROR while getting interface flags: No such device
Bind socket to interface: No such device
Failed to bring up ath0.


--------- Here I lost network connectivity, and it did not come up again.