Re: [Anima] WGLC on draft-ietf-anima-stable-connectivity-03 - Respond by July 28, 2017

Brian E Carpenter <> Thu, 03 August 2017 23:34 UTC

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To: Toerless Eckert <>
Cc: Anima WG <>
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From: Brian E Carpenter <>
Organization: University of Auckland
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Date: Fri, 04 Aug 2017 11:34:57 +1200
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Subject: Re: [Anima] WGLC on draft-ietf-anima-stable-connectivity-03 - Respond by July 28, 2017
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I wrote: "Generally -04 is almost there..."

I meant: Generally -05 is almost there...


On 04/08/2017 11:31, Brian E Carpenter wrote:
> I'm just coming back on a couple of points. Generally -04 is almost there...
> On 03/08/2017 13:08, Toerless Eckert wrote:
> ...>>> 2.1.8.  Long term direction of the solution
>>> ...>    1.  NMS hosts should at least support IPv6.  IPv4/IPv6 NAT in the
>>>>        network to enable use of ACP is long term undesirable.  Having
>>>>        IPv4 only applications automatically leverage IPv6 connectivity
>>>>        via host-stack options is likely non-feasible (NOTE: this has
>>>>        still to be vetted more).
>>> That NOTE needs to be cleared up. Something like 464XLAT (RFC6877)
>>> might be a good compromise.
>> See the rewritten SIIT section. IMHO, there can be no simpler "network" based
>> address translation. Where network based means that the translation happens
>> in some device he network operator needs to provision. Like the ACP edge device.
>> Or even an additional address translation device.
>> So, the only IMHO easier option is when the OS of the NMS host would internally
>> have IPv4/IPv6 translation so the device/VM looks to the outside like full IPv6.
> Yes, that is exactly the effect of 464XLAT in the end-system (not in the
> router).
>> Alas, i didn't have the time to investigate these options. And most likely if at
>> all you could only make those work for linux.
> Linux or Windows, yes. In a vendor's router o/s, who knows? But maybe they
> will all support IPv6 anyway?
>> So, for now i just remove the note and clarified the last sentence a bit.
>> If there is anything specific to be said bout why 464XLAT might be better
>> longer term, let me know and i can add it. For now it looks like yet another
>> network device configured option to me, but i have not tried to understand it
>> all the way.
> I think you'd need one of the 464XLAT authors to have a look at the scenario,
> because I don't claim to understand it all.
> ...
>>>>    Using current registration options implies that there will not be
>>>>    reverse DNS mapping for ACP addresses.
>>> Really? I assume we're talking about two-faced DNS, and afaik nothing
>>> stops an operator providing reverse mapping in the private DNS.
>>> That seems to be implied by the following paragraphs, so the text
>>> seems inconsistent anyway.
>> I know it under the name "split-horizon DNS". Is there any reference ?
> The DNS community in the IETF hates split DNS so much that
> not much has been written about it. I did find these:
> Regards,
>     Brian