I would suggest you look at updating your current wireless solution. I would consult with your Extreme Sales Representative or Extreme Partner to see what options you have. With the current code/product set you are using I would not suggest a WAN deployment because you do not have the ability to securely encrypt all the data traffic across the WAN link.
New code/product will give you the ability to...
-Encrypt user and management data via ipsec
-"Sites" mode support - AP's do not have to be tethered to a controller in order to maintain constant wireless service
-Locally authenticate users at a remote site location versus tunneling
-Doug
Doug Hyde
Director, Technical Support / Extreme Networks