stephen@deepthought:~$ sudo /etc/init.d/networking restart
 * Reconfiguring network interfaces...                                          RTNETLINK answers: No such process
There is already a pid file /var/run/dhclient.eth0.pid with pid 9280
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/

wifi0: unknown hardware address type 801
wifi0: unknown hardware address type 801
Listening on LPF/eth0/00:00:39:2e:c5:c6
Sending on   LPF/eth0/00:00:39:2e:c5:c6
Sending on   Socket/fallback
DHCPRELEASE on eth0 to 192.168.1.1 port 67
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/

wifi0: unknown hardware address type 801
wifi0: unknown hardware address type 801
Listening on LPF/eth0/00:00:39:2e:c5:c6
Sending on   LPF/eth0/00:00:39:2e:c5:c6
Sending on   Socket/fallback
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 5
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 6
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 8
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 11
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 1
No DHCPOFFERS received.
No working leases in persistent database - sleeping.
                                                                         [ OK ]
stephen@deepthought:~$ ifconfig
ath0      Link encap:Ethernet  HWaddr 00:02:78:41:A8:ED
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:8911 errors:0 dropped:0 overruns:0 frame:0
          TX packets:8456 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:7428790 (7.0 MiB)  TX bytes:1787786 (1.7 MiB)

eth0      Link encap:Ethernet  HWaddr 00:00:39:2E:C5:C6
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:0 (0.0 b)  TX bytes:0 (0.0 b)

eth0:avah Link encap:Ethernet  HWaddr 00:00:39:2E:C5:C6
          inet addr:169.254.7.239  Bcast:169.254.255.255  Mask:255.255.0.0
          UP BROADCAST MULTICAST  MTU:1500  Metric:1

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:255 errors:0 dropped:0 overruns:0 frame:0
          TX packets:255 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:114762 (112.0 KiB)  TX bytes:114762 (112.0 KiB)

wifi0     Link encap:UNSPEC  HWaddr 00-02-78-41-A8-ED-00-00-00-00-00-00-00-00-00-00
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:56085 errors:0 dropped:0 overruns:0 frame:57
          TX packets:11168 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:199
          RX bytes:11832442 (11.2 MiB)  TX bytes:2101494 (2.0 MiB)
          Interrupt:11

stephen@deepthought:~$ cat /etc/network/interfaces
# 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 dhcp

iface ath0-home inet static
   address 192.168.1.20
   netmask 255.255.255.0
   up flush-mail
stephen@deepthought:~$