For external access like you describe, you need to have a NAT/global pair or statics. Below is an example of each. I am not sure why you added the nat 0 to the post, but I just want you to realize it is most like for VPN traffic.
nat (inside) 1 192.168.1.0 255.255.255.0
global (outside) 1 172.16.2.0 255.255.255.240 OR global (outside) 1 interface
Table of ContentsIntroductionVersion HistoryPossible Future
UpdatesDocuments PurposeNAT Operation in ASA 8.3+ SectionsRule Types
Network Object NATTwice NAT / Manual NATRule Types used per SectionNAT
Types used with Twice NAT / Manual NAT and Network Obje...
Table of Contents Introduction:This document describes details on how
NAT-T works. Background: ESP encrypts all critical information,
encapsulating the entire inner TCP/UDP datagram within an ESP header.
ESP is an IP protocol in the same sense that TCP an...