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Re: [v6ops] New Version Notification for draft-naveen-slaac-prefix-management-00.txt

Brian E Carpenter <brian.e.carpenter@gmail.com> Wed, 21 November 2018 19:58 UTC

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To: "Templin (US), Fred L" <Fred.L.Templin@boeing.com>, Mikael Abrahamsson <swmike@swm.pp.se>
Cc: Naveen Kottapalli <naveen.sarma@gmail.com>, 6man WG <ipv6@ietf.org>, v6ops list <v6ops@ietf.org>
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From: Brian E Carpenter <brian.e.carpenter@gmail.com>
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Date: Thu, 22 Nov 2018 08:58:50 +1300
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Subject: Re: [v6ops] New Version Notification for draft-naveen-slaac-prefix-management-00.txt
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On 2018-11-22 07:40, Templin (US), Fred L wrote:
> Hi Mikael,
> 
>> -----Original Message-----
>> From: Mikael Abrahamsson [mailto:swmike@swm.pp.se]
>> Sent: Wednesday, November 21, 2018 10:23 AM
>> To: Templin (US), Fred L <Fred.L.Templin@boeing.com>
>> Cc: Naveen Kottapalli <naveen.sarma@gmail.com>; Brian E Carpenter <brian.e.carpenter@gmail.com>; 6man WG <ipv6@ietf.org>;
>> v6ops list <v6ops@ietf.org>
>> Subject: RE: [v6ops] New Version Notification for draft-naveen-slaac-prefix-management-00.txt
>>
>> On Wed, 21 Nov 2018, Templin (US), Fred L wrote:
>>
>>> That particular example does not relate specifically to the DHCPv6-ND
>>> proposal; the proposal is not out to solve interactions between SLAAC
>>> and DHCPv6, but in this particular example common sense should prevail.
>>
>> I know, and that's why I don't like it. I want this problem solved, not
>> glossed over.
>>
>>> The LDRA is a DHCPv6 relay agent like any other. The behavior of DHCPv6
>>> relay agents wrt prefix delegation is covered in RFC3633, Section 14.
>>
>> Errr, it's "covered" in the fact that it doesn't say how to do that.
>>
>> "If a delegating router communicates with a requesting router through
>>     a relay agent, the delegating router may need a protocol or other
>>     out-of-band communication to add routing information for delegated
>>     prefixes into the provider edge router."
>>
>> It doesn't say "inspect the relayed message and guess that you might need
>> to install a route and keep state for that route". How do you do this?
>> I have seen several relay implementations that relayed the message just
>> fine but didn't install any route, leaving the PD useless for the end
>> user.
> 
> In a case that I care about, the delegating router and relay agent are on
> one and the same platform. So, the delegating router does just what the
> spec says, and the relay agent's needs are satisfied. Maybe Ole can say
> more about what is expected when the delegating router and relay
> agent are on different platforms.

Since DHCPv6 is a separate entity from any routing protocol, this
is a case where inside a single box they could be linked by a privately
defined API but in different boxes they would need a protocol, which
could of course be either proprietary or standardised. What's new
here?

    Brian

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