This is a dynamic NAT setup. So you will not be able to be on the outside of the firewall and ping 184.108.40.206 because the firewall doesn't know which ip address from the 192.168.100.x address you want it to translate to.
To ping from the outside to the inside you will need a static eg.
static (inside,outside) x.x.x.x 192.168.100.x
where x.x.x.x is an IP address presented to the outside and 192.168.100.x is an IP address on the inside that maps to x.x.x.x.
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...