Within the GUI, if you choose under the Action:translated packet Source NAT Type "Static and both source address and destination address "Original" what is that really used for if you are just natting to same original IP?
Typical use case is when you have a site-to-site VPN and you want to ensure communication using the original IP address. Without this nat exemption/no-nat rule typically the packet would hit a dynamic nat rule and be natted behind the interface of the ASA or a nat pool. So you'd define the nat exemption rule above the dynamic rule to ensure the traffic is not translated.
Typical use case is when you have a site-to-site VPN and you want to ensure communication using the original IP address. Without this nat exemption/no-nat rule typically the packet would hit a dynamic nat rule and be natted behind the interface of the ASA or a nat pool. So you'd define the nat exemption rule above the dynamic rule to ensure the traffic is not translated.
Because there are other options under it. if you do not choice "original" and select other options, other boxes will be available to choice. But in this case "original" is default behavior wether you wont need translate the packet.
As already said by the Expert RJI it is mainly used in VPNs. I would suggest to visit below article for more details. It has various flavours of NAT explained. There may be other use cases as well when you want traffic should not be NATTed.
