Re: IPv6 only host NAT64 requirements?

Brian E Carpenter <brian.e.carpenter@gmail.com> Wed, 15 November 2017 23:36 UTC

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Subject: Re: IPv6 only host NAT64 requirements?
To: james woodyatt <jhw@google.com>, Ole Troan <otroan@employees.org>
Cc: 6man WG <ipv6@ietf.org>, Mark Andrews <marka@isc.org>
References: <m1eEGbJ-0000EhC@stereo.hq.phicoh.net> <D43E103C-27B8-48CF-B801-ACCF9B42533E@employees.org> <m1eEHPS-0000FyC@stereo.hq.phicoh.net> <59B0BEC0-D791-4D75-906C-84C5E423291B@employees.org> <m1eEIGX-0000FjC@stereo.hq.phicoh.net> <73231F8D-498E-4C77-8DA8-044365368FC9@isc.org> <CAKD1Yr1aFwF_qZVp5HbRbKzcOGqn==MRe_ewaA8Qc8t3+CVu_Q@mail.gmail.com> <44A862B7-7182-4B3A-B46E-73065FC4D852@isc.org> <D42D8D7A-6D19-4862-9BB3-4913058A83B6@employees.org> <CAFU7BARCLq9eznccEtkdnKPAtKNT7Mf1bW0uZByPvxtiSrv6EQ@mail.gmail.com> <183A8772-6FEF-43BD-97F9-DD4A2E21DB90@google.com> <5D9D33A8-88F0-4758-84FA-BCB364E8013F@employees.org> <16B61573-E233-40ED-8A22-CD145EBB8F98@google.com>
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Organization: University of Auckland
Message-ID: <6cb115a1-dec8-f31c-2865-7aca032bc771@gmail.com>
Date: Thu, 16 Nov 2017 12:36:37 +1300
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On 16/11/2017 12:04, james woodyatt wrote:
> On Nov 15, 2017, at 13:47, Ole Troan <otroan@employees.org>; wrote:
>>
>>>> IMHO the optimal solution is:
>>>> - the network SHOULD provide a host with NAT64 prefix information in RA;
>>>
>>> Disagree. If the network has NAT64, then it should deploy RFC 7225. Ye gods, this is the very last thing that should be jammed into RA messages.
>>
>> Do we really want PCP in IPv6?
> 
> If we have any kind of NAT, then we need PCP. Using NAT without PCP considered harmful. That goes for NAT64 and NAT66.

I have a more practical view. We can't assume that IPv6 hosts
grok DHCPv6, and we can't assume they grok PCP. We know that they
grok RAs, although of course they need an update to grok a new
option. So it seems to me that there isn't much doubt about the
need for an RA based solution.

    Brian

> 
>> Is PCP successful in IPv4?
> 
> Well, there was this: <https://www.ietf.org/proceedings/88/slides/slides-88-pcp-5.pdf <https://www.ietf.org/proceedings/88/slides/slides-88-pcp-5.pdf>>
> 
>> Or does it even work well with A+P based solutions?
> 
> 
> Designed expressly for it.
> 
> 
> --james woodyatt <jhw@google.com <mailto:jhw@google.com>>
> 
> 
> 
> 
> 
> 
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