Re: IPv4 only apps [was: IPv6 only host NAT64 requirements?]

Brian E Carpenter <brian.e.carpenter@gmail.com> Tue, 14 November 2017 02:11 UTC

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Subject: Re: IPv4 only apps [was: IPv6 only host NAT64 requirements?]
To: Ole Troan <otroan@employees.org>
Cc: Philip Homburg <pch-ipv6-ietf-4@u-1.phicoh.com>, 6man WG <ipv6@ietf.org>
References: <m1eEGbJ-0000EhC@stereo.hq.phicoh.net> <D43E103C-27B8-48CF-B801-ACCF9B42533E@employees.org> <m1eEHPS-0000FyC@stereo.hq.phicoh.net> <909eb642-b2a0-2fb5-8f41-297e013ae307@gmail.com> <E6BCB92F-615A-4692-8AF2-D993D5B9AF7F@employees.org> <f7baaadf-33c3-7fc2-d90e-872a0f69a5fa@gmail.com> <50F8194E-E887-4940-8ED0-CA4FD9600093@employees.org>
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Organization: University of Auckland
Message-ID: <79fa6f37-efdf-4ba1-49bc-a8da1d33fd43@gmail.com>
Date: Tue, 14 Nov 2017 15:11:52 +1300
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On 14/11/2017 14:57, Ole Troan wrote:
> Brian,
> 
> [...]
> 
>>> This thread is about a IPv6 only, single stack host connecting to an IPv6 only network.
>>> With a backdoor to the IPv4 Internet for legacy destinations.
>>
>> And that neglects the legacy that most such hosts have inside them.
>> I have a bunch in the host I'm typing on right now, which is connected
>> via NAT64 for the week.
> 
> I don't understand what you mean with the above.
> I guess this is where we have to be extremely careful with terminology use.
> 
> If you are using the IPv6 only + NAT64 network you can't possibly use the legacy IPv4 only stuff in your laptop...?

Indeed. Because my laptop isn't providing a NAT46 bump in the stack, for example.

I haven't analysed this at all. What I'm saying is that we haven't done this;
we've simply sneered at application developers who haven't added IPPROTO_IPV6
to all their network code. Sneering doesn't solve much.

    Brian
> 
> Cheers,
> Ole
>