Re: [dhcwg] DHCP Relay and Prefix Delegation

Alexandre Petrescu <alexandre.petrescu@gmail.com> Tue, 26 July 2016 14:09 UTC

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To: Ian Farrer <ianfarrer@gmx.com>, dhcwg@ietf.org
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From: Alexandre Petrescu <alexandre.petrescu@gmail.com>
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Date: Tue, 26 Jul 2016 15:54:37 +0200
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Subject: Re: [dhcwg] DHCP Relay and Prefix Delegation
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Hi Ian,

Le 25/07/2016 à 17:08, Ian Farrer a écrit :
> Hi Alexandru,
>
> Thanks for the pointer to the document. I’ve had a look through it
> and whilst it’s certainly related, the specific problem that I’m
> seeing in vendor’s implementations is only really touched upon in
> Section 5.1. Yes, snooping is implemented, but the way that this is
> implemented, the messages that do/don’t get forwarded and the errors
>  that get generated when things are not working are pretty much
> variable from vendor to vendor (and in one case, there are two
> different implementations in the same platform with differing
> behaviours).
>
> I would like to see an effort to define this behaviour better and
> volunteer to work on it. I’m not sure whether this draft is
> necessarily the right starting point as it’s more concerned with the
>  route advertisement part of the problem and enumerating ways that
> this could be performed, but it really depends on how this problem is
> scoped.

Our concern is mostly related to routing (may need routing table
insertion/deletion upon prefix allocation, depending on the addressing
architecture).

At the same time I agree other aspects than just routing need to be
considered at Relay during the Prefix Delegation operation.

In that sense I am interested if new draft gets started.

> I’m also aware that RFC7513 section 6 has quite some detail of how
> DHCPv6 snooping works in SAVI for DHCP. I haven’t been through this
> in detail yet, but it’s probably got useful stuff in there.

Would need to check how SAVI relates to the dynamically allocated prefix.

Further, I wonder (1) what the security considerations section would
contain and (2) which platform vendor has equipment supporting Prefix
Delegation.

Alex

>
> Cheers, Ian
>
>> On 20 Jul 2016, at 17:00, Alexandre Petrescu
>> <alexandre.petrescu@gmail.com> wrote:
>>
>> Hello,
>>
>> There was a discussion today in the DHC WG meeting about the
>> DHCPv6bis XML.  One issue raised was that maybe a clarification was
>> needed about the problem of a Relay in a DHCPv6 Prefix Delegation
>> setting.
>>
>> We wrote a draft earlier on a problem in this setting:
>> draft-petrescu-relay-route-pd-problem-00
>>
>> Alex
>>
>> _______________________________________________ dhcwg mailing list
>> dhcwg@ietf.org https://www.ietf.org/mailman/listinfo/dhcwg
>
>