Cisco Cisco ASA 5515-X Adaptive Security Appliance - No Payload Encryption Installation Guide

The NAT feature has been redesigned for increased flexibility and functionality. All NAT and 
NAT-related commands have been redesigned. This section describes how your NAT configuration is 
migrated to the new NAT commands. For ASDM users, see the relevant “ASDM” subsections. This 
section includes the following topics:

Almost all NAT configurations will migrate seamlessly. In the rare cases when user intervention is 
required, you will be notified. There will never be an unreported loss of security after migration. See the 

The following commands are no longer supported; they are migrated to new commands, and are then 
removed from the configuration.

nat (old version)

sysopt nodnsalias—This command is not migrated; instead, configure the dns option within the 
new NAT commands.

The alias command was never supported in ASDM.