To support more than two interfaces per context and enable NAT configurations, the firewall must operate in routed mode. Since the firewall was previously in transparent mode, the network engineer needs to change it to routed mode.
Steps:
* Access the CLI of the Secure FTD device.
* Run the commandconfigure firewall routedto switch the firewall from transparent mode to routed mode.
* Reregister the FTD device with the FMC by running theconfigure manager add <FMC_IP>
<Registration_Key>command from the FTD device CLI.
This will ensure that the firewall can support the required NAT configurations and more than two interfaces per context.
References:Cisco Secure Firewall Management Center Device Configuration Guide, Chapter on Routed Mode Configuration.