Re: [homenet] In-network connectivity and HNCP: IPv6 ULA

Brian E Carpenter <brian.e.carpenter@gmail.com> Thu, 19 July 2018 01:52 UTC

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To: Ted Lemon <mellon@fugue.com>, Juliusz Chroboczek <jch@irif.fr>
Cc: homenet@ietf.org
References: <87bmb4oy1w.wl-jch@irif.fr> <CAPt1N1nz+SAZNjUEFQ1GzmrskWW0DAmh1TNaN1icPsD-YPd69g@mail.gmail.com>
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
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Date: Thu, 19 Jul 2018 13:52:28 +1200
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Subject: Re: [homenet] In-network connectivity and HNCP: IPv6 ULA
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Ted,
On 19/07/2018 13:36, Ted Lemon wrote:
> In order for IPv6 to be useful, you need naming to work. We had this
> discussion when I brought this up last year. It should be possible for an
> IPv6-only homenet to work. But if we want homenet to be widely adopted, I
> do not think this is the correct default behavior: 

What "this" do you mean? Switching to ULAs to maintain local
connectivity? What's the surprise? There's no reason there
wouldn't be corresponding AAAA records, is there?

> it violates the
> principle of least surprise. Further, unless you prevent services from
> advertising IPv4 addresses, 

We have a plan for that: draft-ietf-6man-ipv6only-flag-01

    Brian

> dropping the IPv4 uplink definitely will cause
> connections to hang.
> 
> On Wed, Jul 18, 2018 at 8:43 PM Juliusz Chroboczek <jch@irif.fr> wrote:
> 
>> During his talk, Ted claimed that he lost all connectivity when his uplink
>> went down.  This should not happen -- HNCP normally maintains an IPv6 ULA
>> that remains stable no matter what happens to DHCPv6 prefix delegations or
>> DHCPv4 leases.  This is described in Section 6.5 of RFC 7788, and it is
>> the default behaviour of hnetd.
>>
>> Either Ted had tweaked the configuration of hnetd (which one should not
>> do -- hnetd does the right thing out of the box), or he was using software
>> that doesn't speak IPv6 or ignores ULAs.  At any rate, HNCP does not have
>> the issue that Ted described.
>>
>> -- Juliusz
>>
>> _______________________________________________
>> homenet mailing list
>> homenet@ietf.org
>> https://www.ietf.org/mailman/listinfo/homenet
>>
> 
> 
> 
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