I would like to disable double NAT in specific SSID in some wireless networks. For example I have to SSID A and B, I would like that A networks has DHCP given by my Aruba AP and that network B would have DHCP from de router with the original IP´s that the ISP router would give them normally. Some one knows if this is possible?
Sure, if you create wireless employee networks, you can set the IP addressing as "Same as a local network" which is the default and will bridge traffic. If instead you select "Specific to this wireless network", then the traffic will be NAT'ed when coming out of the uplink port.
The AP should not be installed as a gateway if you want to bridge one or more SSIDs.