Question Re: best practices

Tim Chown tjc at
Mon May 9 18:49:18 CEST 2011

On 9 May 2011, at 17:38, Austin Schutz wrote:

> I'm curious about this having read a couple books about the IPv4 -> IPv6 transition. I would like to know what the current best practice is.
> Given: A small set ipv6 only network running various protocols, call this the "IPv6 only server network", and a large legacy client IPv4 network, call this, say, "The Internet".
> In this scenario the operator of the ipv6 network may not have the luxury of implementing dual stack on the legacy IPv4 network. Given that the methodology of providing access to this network via NA(P)T-PT has been obsoleted, what is the current best practice for solving this problem?
> I'm not really interested in a philosophical sort of "what I think should happen" sort of debate, but rather a practical "this is what I have implemented in my network" or "this is how I would solve this issue given currently available equipment, software, and configurations techniques".
> Answers involving proposed but not implemented drafts are interesting but not necessarily helpful.

Hi Austin,

Take a look at NAT64/DNS64 and associated protocols which have recently emerged as RFCs.  See RFC 6144, 6145, 6146 and 6147.

There is at least one implementation here, albeit on earlier versions:

You may of course find in some cases dual-stack ALGs can provide what you need.


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