the default mss ( meximum segment size ) of 1380 is good enough for most of the ethernet networks.however,if a segment comes with a size of mode then 1380,firewall drops it.segments of size of more then 1380 is normal ,depending on what media is used for communication.Allowing such packets do not introduce any security risks....it's an add on security feature of asa which let you know that some packets are not following the default rfc standards.....i have never seen any issues when such packets are allowed through f/w ( believe me,in TAC,we see this every next day . :)
We are having a similar issue. We have an ASA5505 and on this network we have a scanner/copier that does scan to email. We are noticing that when the copier/scanner attempts to contact an email server that resides on the other side of the tunnel, we are getting the 419001 error messages.
Will the code you posted work for this? The destination port for this traffic is 25.
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...