If you are planning for an IPv6 only Data Center (and if you plan for the future, you are doing that) you may have noticed that there are applications out there that are just not ready for IPv6 yet. So you need some kind of 6-4 translation, either locally or in the network. From the Tayga wash label:
TAYGA is an out-of-kernel stateless NAT64 implementation for Linux that uses the TUN driver to exchange IPv4 and IPv6 packets with the kernel. It is intended to provide production-quality NAT64 service for networks where dedicated NAT64 hardware would be overkill.
Tayga is production quality software. We use it for ipv4 access for large amounts of production nodes every day. It is for example well suited for giving 6-to-4 network access for docker nodes. You may find more information about Tayga on it’s homepage: http://www.litech.org/tayga/
I pushed tayga-0.9.2-3 to Fedora 22 and 23 stable today. It will trickle down to your local mirrors in a couple of days. I have also forked tayga for epel5, epel6, and epel7. Please contribute by testing tayga for EPEL: https://bodhi.fedoraproject.org/updates/?packages=tayga
Update: tayga is now available in EPEL
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