Hystorically there are many bugs in the "DNS doctoring" functionality on PIX. As a possible workaround disable "port redirection" in the static (use entire IP address for your www server, rather than just port 80). If it doesn't help try to reconfigure static the other way round: "static (outside, inside) 192.168.254.50 18.104.22.168 dns". Also, check the DNS fixup: "fixup protocol dns". It should be turned on.
I'm configuring all our publicly accessible machines (for Web, Mail and DNS) on the DMZ, with static mappings to appropriate addresses on the inside and outside. Everything works except for DNS rewriting on the static mappings, which persists in offering the DMZ local addresses, rather than the corresponding inside or outside address.
I've tried reversing the static commands, and I have only the undocumented 'fixup protocol domain nn'.
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...