Cisco Firewalls

Appendix . NAT and ACL Changes in ASA 8.3

This appendix covers the following topics:

• Network Object NAT examples

• Twice NAT examples

• Summary of NAT syntaxes in ASA 8.3

• Global ACLs

“We shall not cease from exploration/And the end of all our exploring/Will be to arrive where we started/And know the place for the first time” —T.S. Eliot.

Most of the Adaptive Security Appliance (ASA) topics studied throughout the book assume the use of ASA version 8.2. This appendix presents some important changes introduced by ASA 8.3 in the way ASA handles Network Address Translation (NAT) and Access Control Lists (ACL):

• NAT Redesign: NAT is completely redesigned in 8.3 code to simplify operations and facilitate creation of rules that concurrently ...