As per your explanation, I understood that DMZ has equal security level as inside (LAN) network. Then, your configuration must contain the command " same-security-traffic permit inter-interface". You should remove this command by saying that "no same-security-traffic permit inter-interface" in the global mode of ASA. Then modify the security level of DMZ slightly lower than inside network. Now, the networks in the DMZ could not access the inside network. As per your requirement, you can put ACL's to allow the needed traffic to come inside into LAN.
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...