On what device did you adjust the mtu size to 1400 on? The pix or the router? Did you alsomake an adjustment on the tcpmss max size sysopt option on the pix (i.e., instead of using 1380, did you use 1280) - I believe that this needs done even if the mtu of 1400 was set on the pix-to-router interface?
On what router did you receive the error message, the left or the right router, or both - (using your topology diagream)?
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...