In short, both load-balancing and VRRP (redundancy) cannot be configured at the same time.
Further, to help you choose, if your objective is to accommodate a lot of VPN tunnels (I am talking like hundreds of them), then use load-balancing. In this case, there is some amount of redundacy as well because when the master concentrator goes down, another concentrator in the cluster takes up the role and the clients can keep connecting.
If redundancy is all you are looking for and do not have hundreds of VPN connections, then use VRRP.
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...