You can adjust the MTU size (from 256 to 1406 bytes) for SSL VPN connections established by the client with the svc mtu command from group policy webvpn or username webvpn configuration mode:
[no] svc mtu size
This command affects only the AnyConnect client. The legacy Cisco SSL VPN Client (SVC) is not capable of adjusting to different MTU sizes.
The default for this command in the default group policy is no svc mtu. The MTU size is adjusted automatically based on the MTU of the interface that the connection uses, minus the IP/UDP/DTLS overhead.
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...