If your PIX is not "heavily loaded" then it's OK to use the same interface for both of these. The LAN interface is used for config replications and regular health checks. The stateful link will be much busier usually, but what you don't want to end up with is that the link is so saturated that the health checks can't get through and the units start failing over cause they think things are bad. The issue is exactly what is "heavily loaded", for which I really can't tell you an exact answer.
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...