Direct Access Transition Technologies and Their Associated Caveats.

Hi All,

I've been doing some reading on Direct Access in server 2012 R2 and I'd just like a few things clarified:

1. The DA server MUST be domain joined, yes? Not keen on this if so.
2. Toredo and 6to4 are faster and more efficient than IP-HTTPS but require incoming and outgoing ports opened on whatever firewall device the traffic traverses?
3. Toredo and 6to4 do NOT require the internal network to be IPv6?
4. IP-HTTPS can ONLY work if the internal network is IPv6? If so what is required to make the network IPv6?
5. When a client is behind a proxy server it will ONLY attempt to use IP-HTTPS?

Cheers
C