Nice, I call Rodolpho and I'm from Brazil. Sorry if my English is bad. I wonder whether WAAS will work in topology with my GRE tunnels without problems, because I have over 20 offices with tunnels reaching in my datacenter by MPLS network. NM modules put in offices in my ISR routers.
Thank you very much!
Yes, you should be able to implement WAAS in your topology. You can intercept on your ISR (even on the tunnel interfaces) and as long as your interception and optimization is inside the checkpoint FW, you should be fine in the DC.
Hope that helps,