Unfortunately, the ASA only currently supports DDNS updates using RFC 2136 and does not support the HTTP-based updates that DynDNS uses. However, there is an enhancement request filed for this (CSCsl46782). You can use this link to follow the status of the enhancement:
Enhancement feature for Dynamic DNS using http-based updates:
Haven't tried it yet. I ordered an ASA5505 yesterday and hope to use DynDNS for it. If not, I'll have to place a home router, or an 1841 in front of it to get it to work. I'll update this page if it works or not.
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...