site to site vpn, intermittent issue and packets dropped
VPN issue, from VPN Mod on 6500 to 3745, over lan extension circuit.
mirrored acl's with deny at the top for UDP any any, then a series of permits at an IP level. All works well when testing out of hours on all applications. Next day all fine until mid morning then issues reported. Saw drops on interface fixed with hold-queue and issue went but appeared again a little later. Worked out DNS was not working correctly. cleared crypto sa to fix, issue came back later. Asked to lift crypto, so did. have tested set up in lab but on different hardware and can false similar errors when messing with acl to make them not mirrored. Basically on fly remove acl entry for UDP on one end. UDP stops working, TCP performance issues, ICMP intermittent. Need to lab this again to get more detail.
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...