Last night I was looking through Cisco documentation looking for the 8.2 command line configuration guide for the ASA. Mush to my surprise, directly above the 8.2 configuration guide was one for 8.3 that said ‘New!’ next to it. So I opened up the document and I found one item that surprised me very much.
The NAT configuration was completely redesigned to allow greater flexibility and ease of use. You can now configure NAT using auto NAT, where you configure NAT as part of the attributes of a network object, and manual NAT, where you can configure more advanced NAT options.
The following commands were introduced or modified: nat (in global and object network configuration mode), show nat, show nat pool, show xlate, show running-config nat.
The following commands were removed: global, static, nat-control, alias.
It also looks like you’ll need a memory upgrade on all platforms to run it.
Read about all the new changes/enhancements here