I am migrating our VPN network from traditional VPN to DMVPN. However I have a concern of security. Since nothing needs to be configured on HUB when turn on remote sites, so anyone who knows the parameters of the VPN settings can connect to our network from anywhere. How should we address this issue? Is there a way to do certificate based authentication? If so, could anyone send me the link of documents?
Since DMVPN relies on IPSEC phase 1 and 2 you can certainly do certificate based authentication for IKE just as any other IPSec method, follow the next guidelines for the configuration and make sure that the CRL is valid and reachable, or else no Spoke will be able to connect:
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...