ACL Outside_1_crytpomap defines a class C network for 172.20.20.0/24. In your descriptions you talk about just one server (172.20.20.6). Do you have other hosts in the 172.20.20.0/24 network that need to traverse the VPN? Should acl Outside_1_cryptomap be permit ip host 172.20.20.6 192.168.31.0 255.255.255.0?
Keep in mind that VPNs need to match both sides. Is the Multitech defining a single host or a class C network?
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...