ifconfig
eth0      Link encap:Ethernet  HWaddr 00:04:20:1A:04:BF  
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:5772 errors:0 dropped:0 overruns:0 frame:0
          TX packets:3 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:464132 (453.2 KiB)  TX bytes:363 (363.0 B)
          Interrupt:52 

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:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

# cat /etc/wpa_supplicant.conf
ctrl_interface=/var/run/wpa_supplicant
update_config=1

network={
	ssid="SqueezeTest"
	scan_ssid=1
	psk="98989898"
	proto=WPA
	key_mgmt=WPA-PSK
}
# cat /etc/network/interfaces
auto lo

iface lo inet loopback

mapping eth0
	script /etc/network/if_mapping
auto eth0=SqueezeTest
iface SqueezeTest inet dhcp
	script /etc/network/udhcpc_action
auto eth0=SqueezeTest
# wpa_ckl  li scan_results
Selected interface 'eth0'
bssid / frequency / signal level / flags / ssid
00:0b:0e:b0:55:04	2437	197	[WPA-PSK-TKIP]	SqueezeTest
00:0b:0e:b0:58:44	2462	185	[WPA-PSK-TKIP]	SqueezeTest
00:0b:0e:4d:e0:04	2412	177	[WPA-PSK-TKIP]	SqueezeTest
00:0b:0e:4d:a0:c4	2462	177	[WPA-PSK-TKIP]	SqueezeTest
# ls -l /etc/network/interfaces
-rw-r--r--    1 root     root          185 Sep 22 14:21 /etc/network/interfaces
#