Basically it is only needed when you are troubleshooting issue with performance as default MTU on internet devices is typically 1500, and if the VPN Client is sending bigger file than 1500, then it would cause fragmentation which could possibly be blocked along the path, and/or taking the server end sometime to reconstruct the fragmented vpn packets.
However, in normal circumstance, the "Set MTU" setting should not be interfere.
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...