I am glad that my first response was helpful. It is not possible to have data transfer on ASA using VPN with only phase 1 because the Security Association that identifies the encryption of data that protects the data in IPsec is negotiated in phase 2. In the phase 1 the ASA is negotiating the working keys that will be used but does not negotiate the encryption parameters until in phase 2.
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...
[toc:faq]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 and UDP are I...