cirdan:/var/run/wpa_supplicant# dhclient ath0
Internet Software Consortium DHCP Client 2.0pl5
Copyright 1995, 1996, 1997, 1998, 1999 The Internet Software Consortium.
All rights reserved.

Please contribute if you find this software useful.
For info, please visit http://www.isc.org/dhcp-contrib.html

sit0: unknown hardware address type 776
wifi0: unknown hardware address type 801
sit0: unknown hardware address type 776
wifi0: unknown hardware address type 801
Listening on LPF/ath0/00:16:cf:29:aa:0f
Sending on   LPF/ath0/00:16:cf:29:aa:0f
Sending on   Socket/fallback/fallback-net
DHCPDISCOVER on ath0 to 255.255.255.255 port 67 interval 8
receive_packet failed on ath0: Network is down
DHCPDISCOVER on ath0 to 255.255.255.255 port 67 interval 10
DHCPDISCOVER on ath0 to 255.255.255.255 port 67 interval 21
DHCPDISCOVER on ath0 to 255.255.255.255 port 67 interval 11
DHCPDISCOVER on ath0 to 255.255.255.255 port 67 interval 11
No DHCPOFFERS received.
No working leases in persistent database.

Sleeping.