I have following design for IPS and VPN concentrator.
Internet --> Router ---> IPS ----> VPN 3060.
When VPN from Internet to VPN 3060, all work fine. But weird is that when IPS is in inserted between router and VPN3060. The VPN client after login after a while ot when they start access application especially Windows remote desktop or CSM client access to CSM server ( I believed large packets MTU is use) the VPN connection get 'hang' mean the connectivity lost , the ping to intenal server suddent timeout...later the VPN session disconnect.
If the inline IPS is remove the path ... all very fine.
What cause IPS block the VPN trafic ?
Anyone experience it ?
Cisco Intrusion Prevention System, Version 5.1(1)S231.0
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...