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Re: [Casm] [homenet] prefix assignment

Juliusz Chroboczek <jch@irif.fr> Wed, 29 March 2017 20:56 UTC

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Date: Wed, 29 Mar 2017 15:56:22 -0500
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From: Juliusz Chroboczek <jch@irif.fr>
To: Michael Richardson <mcr+ietf@sandelman.ca>
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Subject: Re: [Casm] [homenet] prefix assignment
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brian> But if the CE includes a little autonomic service agent (ASA) which
brian> is in the ISP's security domain (not the SOHO domain), it can act for
brian> HNCP to solicit address space from the ISP. That's the southern side
brian> of the CASM model and the northern side of HNCP.

HNCP just doesn't care.  HNCP has a notion of "External Connection", and
an External Connection may provide one or more External Prefixes.  HNCP
will assign to each link in the HNCP one /64 from each External Prefix.

HNCP doesn't care where these External Connection TLVs come from, but it
is my understanding that there is WG consensus that DHCPv6-PD is the
default mechanism.  I don't think there's anything in any of our RFCs that
would prevent an implementation from obtaining External Prefixes using
a different protocol, e.g. manual configuration, a proprietary
provisioning protocol or even algorithmically derived from an IPv4 address
(as with 6rd).

Both implementations of HNCP are easy to extend with a different mechanism
for obtaining External Prefixes, should you wish to experiment.

-- Juliusz

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