NO-NAT configuration on Cisco ASA Firewall
Cisco ASA firewall has upgraded its command line at the version 8.3 and changed a lot of configurations from their previous style. I recently faced two cases about NO-NAT in both version and want to leave a quick note here.

Example details:

inside IP address: 1.1.1.0/24

outside IP address: 2.2.2.0/24

traffic go through from inside interface to outside interface

Before 8.3

A access-list is needed to filter the interested traffic. This access-list is then used in NAT 0 to ensure all traffic defined in it is not NATed.

access-list NO-NAT permit ip 1.1.1.0 255.255.255.0 2.2.2.0 255.255.255.0

nat (inside) 0 access-list NO-NAT

Begin in 8.3

ASA gave up the configuration style used before for NO-NAT and mandated to use network object. Network object was introduced earlier and more flexible Configure Object Groups], though, it was popular in configurations. The new style use two network objects to define traffic which doesn’t need to be NATed, then render them in new NAT configuration style.
['Ken Lai']
['Cisco', 'Ken Lai', 'Nat', 'Asa', 'Networking']