Direct Access using Teredo behind NAT device

Hello,

I'm currently using DA 2012 with IP-HTTPS with an external LB and the DA server is behind a NAT device. I'm considering using teredo since I read it is possible now to use it behind a NAT device. How would this be implemented? Anyone have any experience doing it?

My setup:

client >>>internet>>>firewall>>>external load balancer>>>DA server.

Thanks.