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I have Cisco wireless controller on site A and connected with 1600 series access point.On my site b I have 1600 series access point no WLC .How to connect these access point over the wan. I want my authentication traffic goes to the controller.
Yes you can. It's called FlexConnect.
Check the link ; http://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/Mobility/emob73dg/emob73/ch7_HREA.html
It is possible,. this is Flexconnect mode, previously know as Hybrid Remote Edge Access Point or H-REAP
Please refer to the below url that will help you to connect two different sites.