if im reading this correctly,the router sits behind the ASA and if so, you can access the ASDM on the enabling http on the outside interface. HTe problem you might have is if you dont know which IP you will be coming from, you are leaving your ASA exposed to everybody.
1) http server
2) http public ip(of where you are coming from) 255.255.255.255 outside
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...