Changing WiFi MAC Address in Leopard

Hello,
I am attempting to change my wireless MAC address. Here's what I've done, yet nothing changes (I am attmepting to change my Wifi address from 00:1c:b3:70:e9:f2 to a1:b2:c3:d4:e5:f6):
ryans-imac:~ Ryan$ ifconfig en1
en1: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
inet6 fe80::21c:b3ff:fe70:e9f2%en1 prefixlen 64 scopeid 0x6
inet 192.168.0.101 netmask 0xffffff00 broadcast 192.168.0.255
ether 00:1c:b3:70:e9:f2
media: autoselect status: active
supported media: autoselect
ryans-imac:~ Ryan$ sudo ifconfig en1 ether a1:b2:c3:d4:e5:f6
Password:
ryans-imac:~ Ryan$
Please advise.
Thanks.

etresoft wrote:
What you want is the "airport" program, conveniently located at /System/Library/PrivateFrameworks/Apple80211.framework/Versions/Current/Resourc es/airport
It will allow you to change your MAC address. Prior to 10.5, the airport command would not change the MAC address for the Airport card, but it works now.
Here is the airport help
./airport AirPort v.522.4 (522.4.0)
Supported arguments:
-z --disassociate Disassociate from any network
-i[<arg>] --ibss=[<arg>] Create IBSS
-x --xml Print info as XML
-s[<arg>] --scan=[<arg>] Perform a wireless broadcast scan.
Will perform a directed scan if the optional <arg> is provided
-r<arg> --repeats=<arg> Repeat the command the specified number of times
-A[<arg>] --associate=[<arg>] Associate to network.
Will prompt for network name if arg is not specified
and if necessary, for a password if the network is using WEP or WPA.
The following additional arguments may be specified with this command:
--bssid=<arg> Specify BSSID to associate with
--password=<arg> Specify a WEP key or WPA password
-I --getinfo Print current wireless status, e.g. signal info, BSSID, port type etc.
-P<arg> --psk=<arg> Create PSK from specified pass phrase and SSID.
The following additional arguments must be specified with this command:
--ssid=<arg> Specify SSID when creating a PSK
-c[<arg>] --channel=[<arg>] Set arbitrary channel on the card
-h --help Show this help
It's not clear to me which command if any will allow a MAC change

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http://blogs.technet.com/b/patrickr/archive/2010/07/28/windows-7-connectivity-problems-in-public-hotspots.aspx
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