Not in production, but we've installed it for testing. We immediately ran into problems that was MTU related where viagenie mismatched the 2 byte MTU in IPv4 with 4 byte in IPv6 and didn't handle that. After reporting this we quickly received a patch that fixed the problem.
They also seem to have other fixes not available in the public distribution (this was a month ago, might have changed).
So my take on this is that viagenie responds well to mail and will fix things, but the software has not been widely tested and is not production quality right now.
But, i would only use NAT-PT for ... no ... i would never use NAT-PT.
The implementations are really not good.
Are some of you have installed one of these two implementations in
production on recent versions of linux? Is it stable, secure, ... ?
I have tested 3 versions of DNS64 and 4 versions of NAT64. I am not
sure what i can share about them. My experience has generally been
good. I feel good with taking my selected vendors to production with
this feature. Users in my beta trial have been happy with the results
and performance. You mentioned Cisco. Cisco has stateless support
today of NAT64, but i am not sure the value of that since it is one
for one. I assume they will have stateful support soon.