How to change the mac address of thunderbolt to ethernet adapter?

Hello everyone,
I am using Macbook pro retina display 2013 version. I have bought a thunderbolt to ethernet adapter in order to connect my Macbook to LAN. But in my area there is a shared line and I have to clone their mac address to my Macbolok. I could not change the mac address of my thunderbot to ethernet adapter. Can anyone please tell me how to change the mac address of thunderbot to ethernet adapter step by step??
Thanks in advance.

Open terminal and type the followings;
1) sudo ifconfig bridge0 ether xx:xx:xx:xx:xx:xx(it will be your new mac address)
2) Type your password to confirm
3) ifconfig bridge0 |grep ether (to see if change is successful)
PS: *This should with your thunderbolt adapter, but its not working usb to ethernet adapters without installing required drivers.
** You may need to do these steps every time you boot your mac.

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X2-XX-XX-XX-XX-XX
X6-XX-XX-XX-XX-XX
XA-XX-XX-XX-XX-XX
XE-XX-XX-XX-XX-XX
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Windows 7 Connectivity Problems in Public Hotspots
http://blogs.technet.com/b/patrickr/archive/2010/07/28/windows-7-connectivity-problems-in-public-hotspots.aspx
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