Twice NAT - Network Address Translation

Every type of address translation we've discussed so far has one thing in common -- only the Source IP was translated -- the Destination IP was left un touched (of the outbound packet). There are times, however, when you need to translate both the Source and Destination, and those situations are what is called a Twice NAT.
To be clear, a Twice NAT is simply one of the four types of translations we've already discussed (Static NAT, Static PAT, Dynamic PAT, Dynamic NAT) applied to both the Source and Destination of a packet. A Twice NAT is sometimes referred to as a Double NAT (among other names).
Typically, a Twice NAT is configured using a Policy NAT, so make sure you watch that video for a clear illustration of Policy NAT.
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