When you say IPS module, do you mean an in-chassis one like an IDSM2, or an external one?
An external one can use a SPAN from each core to take 'copies' of the traffic you want, but you have to watch for oversubscription and overall IDS throughput.
Even the internal IDSM2 can only technically handle 600mbps throughput, so can be oversubscribed.
The one thing "funny" I've seen in my 4 years with the SPAN/6500/external IDS (4250XL I think) is that I get a lot of spoofing messages; my guess is that it's related to the duplication of messages in the 2 SPAN ports (which span specific VLANs) feeding the single IDS.
Oh -- and you can't really feed the internals from an external feed from the other switch, so you'd need to get 2 IDSM2s, I think (You might be able to use either RSPAN or something like that, but I'm not sure you'd really want to do that, just from a 'keeping everything straight' perspective).
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...