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Cisco ASA Series Firewall ASDM Configuration Guide
Chapter 5 Configuring Twice NAT (ASA 8.3 and Later)
Configuration Examples for Twice NAT
Step 6 For the Translated Source Address, click the browse button to add a new network object for the PAT
address in the Browse Translated Source Address dialog box.
a. Add the new network object.
b. Define the PAT address, and click OK.
c. Choose the new network object by double-clicking it. Click OK to return to the NAT configuration.
Step 7 For the Translated Destination Address, type the name of the Original Destination Address
(DMZnetwork1) or click the browse button to choose it.
Because you do not want to translate the destination address, you need to configure identity NAT for it
by specifying the same address for the Original and Translated destination addresses.