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Cisco ASA 5500 Series Configuration Guide using ASDM
Chapter 34 Configuring Twice NAT (ASA 8.3 and Later)
Configuring Twice NAT
Step 2 Set the source and destination interfaces.
By default in routed mode, both interfaces are set to --Any--. In transparent firewall mode, you must set
specific interfaces.
a. From the Match Criteria: Original Packet > Source Interface drop-down list, choose the source
interface.
b. From the Match Criteria: Original Packet > Destination Interface drop-down list, choose the
destination interface.
Step 3 Identify the original packet addresses; namely, the packet addresses as they appear on the source
interface network (the real source address and the mapped destination address). See the following figure
for an example of the original packet vs. the translated packet.