Hi, here your IP on outside interface is 10.10.10.6. In order to establish LAN to LAN VPN, on head office VPN router you need to set peer's public IP address for remote ASA but you don't have it as your remote ASA is behind the ADSL router and can not get public IP, you will need static public IP address on outside interface. Make sure isakmp is enabled on outside interface.
Right now VPN can not be established as the ASA outside IP is private IP and VPN traffic initiated from remote office can not reach the ASA. It will reach once ASA has a public IP and you configure that IP as peer on your head office router.
Look at the ADSL router for any possibilities of IP assignment or NAT.
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...