IP bridge over ConnectPorts

Hi I am looking to do something like described here

http://www.digi.com/support/forum/44447/can-connectport-x2-configured-as-bridge-ip-pass-through-mode

Where the we want IP over xbee/zigbee rather than xbee/zigbee over IP and preferably in a mesh network.

And over what range? Can the antenna be amplified within regulations to cover greater distances?

Can you confirm if this is possible, what would be needed presumably 3+ ConnectPort X2 though which variety and how to go about it or reference to documentation that would describe the like.

Many Thanks
Graham