A subnet mask is supposed to separate the network address (leftmost bits) from the host addresses (rightmost bits). It should always translate to a binary number that masks the leftmost bits with binary ones (i.e. 1111...) and the rightmost bits with binary zeros (i.e. ...0000). Your specified mask translates in binary to:
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...