A 32 bits subnet is a one address subnet , meaning a single host. But your outside interface needs to be in the same subnet than your default gateway. The smallest subnet possible here would be a /30 subnet, wich give 4 addresses (2 usable) .
But .67 and .69 are not part of the same /30 subnet. And .67 would be a broadcast address in a /30 ( 64-65-66-67).
So .67 and .69 can only be part of at least a /29 subnet ( 64-65-66-67-68-69-70)
But you have to verify thisa with your ISP because both devices needs to be configure with the same subnet.
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...