In this configuration example, --The access-list 101 on R2 is used to define the interesting traffic for VPN. --The access-list 175 on R2 is used to exempt the VPN interesting traffic from NAT on router. They keyword "DENY" is used for said purpose.
Similarly its done on Router 3 as well.
Note: You need the access-list 175, if you are doing NAT on router else its not required.
P.S Please do rate this post if you find it helpful to make it easier for others seeking answers to similar queries
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...