We currently have 2 cisco PIX 520 in a failover arrangement. We have been asked to implement an additional layer of PIX firewall behind our current arrangement. So effectively the inside interface of the existing firewall now becomes the outside interface of the new layer of PIX and the inside interface of the new firewall now become the inside network.
This seem an over-protective network in my opinion and I've never seen such an arrangement. Has anyone done or seen this before?? If so do you know any problem that will be encountered?? Can you point be to any doc on the internet or books detailing this arrangement?
There are customers doing this, so you're not alone. The big thing is the NAT'ing on the PIX. Do you want to NAT twice, which is unnecessary, or do you just create static's on one PIX that map to themselves, effectively bypassing NAT.
If you only NAT once, do you do it on the inside or the outside PIX? It shouldn't matter which one, but you need to think about it.
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...