Re: IPv6 only host NAT64 requirements?

Brian E Carpenter <brian.e.carpenter@gmail.com> Tue, 14 November 2017 00:11 UTC

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Subject: Re: IPv6 only host NAT64 requirements?
To: Philip Homburg <pch-ipv6-ietf-4@u-1.phicoh.com>, ipv6@ietf.org
References: <m1eEGbJ-0000EhC@stereo.hq.phicoh.net> <D43E103C-27B8-48CF-B801-ACCF9B42533E@employees.org> <m1eEHPS-0000FyC@stereo.hq.phicoh.net>
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Organization: University of Auckland
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Date: Tue, 14 Nov 2017 13:11:46 +1300
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On 14/11/2017 05:16, Philip Homburg wrote:
...
> But for host software there is a lot more incentive to support dual stack then
> to do the extra step for NAT64.
> 
> The big problem I see for NAT64 is that for old IPv4-only applications you 
> have to make two fundamental changes to the application. The first to 
> make sure that the application handles IPv6 in every possible way. And a
> second pass that makes sure that every place where an IPv4 address literal 
> is handled, works with NAT64. 
> 
> For an application writer it is better to try to avoid doing the second pass.

I think there is a missing document, and it may well belong in v6ops not
6man: "IPv4 Applications on an IPv6-only Host". 

Your text above is probably a good summary of what the document needs
to cover. (I also suspect that if this document existed, we wouldn't need
Jordi's draft attempting to define "IPv6-only".)

   Brian