Same Mac address thrown by several Tablets

Hi,

             So we have to demo our products through Demo apps at the Mobile world, CES or likewise to the customers...we can have different demo apps working on two or three tablets at our counter...and since we need google servers for our demos...we need internet...but when two tablets are connected to the same WIFi, they are throwing exactly same Mac-addresses...hence have same IPs...this results in only one connected to the internet all the time, while rest show connected, but you really cannot access the internet !!

Can there be any possible reason...as such eeproms are same and hence same mac addresses..or can u let me know...how it can be worked around?

--Thanks.