jonah@ubuntu:~$ iwconfig ath0 rate 11M
Error for wireless request "Set Bit Rate" (8B20) :
    SET failed on device ath0 ; Operation not permitted.
jonah@ubuntu:~$ dhclient ath0
There is already a pid file /var/run/dhclient.pid with pid 6055
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
can't create /var/lib/dhcp3/dhclient.leases: Permission denied
Can't create /var/run/dhclient.pid: Permission denied
drop_privileges: could not set group id: Operation not permitted