Stateful failover of IPSec is not available as yet in IOS, although they are talking about it. The best you cna do at the moment is point your IPSec router to a HSRP address at the head-end, and then use the following:
Just setting this up myself ! The only IOS that supports HSRP and VPN tunnels is , I believe , 12.2-8.T5 but this will NOT permit stateful tracking of the IPSEC tunnel so if the HSRP group changes you will loose all current sessions .Try looking for IPsec VPN high Availablility Enhancements under ver 12.2 but unless this feature is migrated to other IOS releases I would suspect some other form of HSRP/VPN offering is on the way .This feature permits tracking of a Crypto map to an HSRP name and sends keepalives to ensure tunnels are torn down and re-established on the new HSRP master .
We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...