Re: [Casm] prefix assignment

Brian E Carpenter <brian.e.carpenter@gmail.com> Wed, 29 March 2017 23:12 UTC

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To: Michael Richardson <mcr+ietf@sandelman.ca>
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Cc: casm@ietf.org, anima@ietf.org, Mark Townsley <townsley@cisco.com>, homenet@ietf.org
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Organization: University of Auckland
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Date: Thu, 30 Mar 2017 12:12:41 +1300
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Subject: Re: [Casm] prefix assignment
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On 30/03/2017 10:38, Michael Richardson wrote:
> 
> Brian E Carpenter <brian.e.carpenter@gmail.com> wrote:
>     >> I just don't see the point of the ASA here.
> 
>     > There's already a thing called an HNCP agent. Why couldn't
>     > it be enhanced to negotiate with an upstream ASA for resources?
> 
> Because it's already done. It's called DHCPv6.
> It already has extensive running code :-)
> It's not even that complex.

All true. But it isn't designed for negotiation as far as I know,
just a request/response.
 
> I would love to request address space via ASA from the DHCPv6 server.
> That would all happen within the ISP's ACP though.

Agreed, that is a little higher up the food chain. Maybe that is as close
to the user as an ASA will get. I don't really care; I just wanted to
explore the way we might fit our various tools together.

> Right now (on DSL lines), the address space mostly comes via radius.
> Which is to say that the problem has been centralized by MBS builders into
> being someone else's problem. Advertising the address space is often done by
> OSPFv3, but there are additional things that would be easier for the DHCPv6
> server to do, such as the DNS delegations that homenet is working on
> finishing.

Yes, indeed, and then we could discuss how the radius server gets new
address space when it runs out.
 
> I think that CASM could very nicely define/extend the prefix ASA to deal with
> DNS reverse names, and as the RIRs (George) said, better link the delegated
> prefix to clear ownership records.

Yes, by defining a full set of relevant objectives.

    Brian