It seems that there are some limitations with ASA devices regarding the possible network topologies.
For example if I have one ASA 5520 which is used for remote access VPN (ipsec) services, and it is located between 4 routers: 2 routers leading to internet and 2 routers to inside network (see the picture).
The routing is done with OSPF, but since there seems to be no loopback interfaces available, I have to bind the RA VPN-service to either one of my outside interfaces. Now if one of the outside routers fails, I loose the VPN-services associated with that (ASA) interface.
If I could use the loopback interface for remote access VPN, OSPF would take care that this IP address is always reachable via some alternate way.
So how is this kind of scenario supposed to be done?
I know that it might be possible to achieve the same functionality with 2 ASAs but this is not what I want.
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...