You are correct. BIND is sending requests through the ASA (ASA is translating and passing the packets - I've taken captures on inside/outside interfaces) but no replies are coming back. I'm wondering if there is some odd DNS packet alteration going on?
I built a Windows DNS server, and things seem to be working normally...
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...