Early Review of draft-ietf-dmm-hnprenum-03
review-ietf-dmm-hnprenum-03-intdir-early-combes-2016-12-19-00

Hi,

First, this is the first time I am trying this new tool for reviewers, so,
sorry if I am making process mistakes.

Please find the official text below:
<JMC>
I am an assigned INT directorate reviewer for draft-ietf-dmm-hnprenum-03. These
comments were written primarily for the benefit of the Internet Area Directors.
Document editors and shepherd(s) should treat these comments just like they
would treat comments from any other IETF contributors and resolve them along
with any other Last Call comments that have been received. For more details on
the INT Directorate, see http://www.ietf.org/iesg/directorate.html.

Please, find my review below:

*** Section 1, p2 ***
"However, a widespread use of PI addresses may cause Border Gateway Protocol
(BGP) scaling problems." Any Ref?

*** Section 7, p6 ***
"The protection of UPN and UPA messages in this document follows [RFC5213] and
[RFC7077].  This extension causes no further security problem."

Sorry but, I must admit I don't agree:

[RFC5213] says:
"The Mobile IPv6 specification [RFC3775] requires the home agent to prevent a
mobile node from creating security associations or creating binding cache
entries for another mobile node's home address. In the protocol described in
this document, the mobile node is not involved in creating security
associations for protecting the signaling messages or sending binding updates.
Therefore, the local mobility anchor MUST restrict the creation and
manipulation of proxy bindings to specifically authorized mobile access
gateways and prefixes. The local mobility anchor MUST be locally configurable
to authorize such specific combinations.  Additional mechanisms, such as a
policy store or Authentication, Authorization, and Accounting (AAA) may be
employed, but these are outside the scope of this specification."

Based on the fact that an operator could set up internal check-ups about the
allowed HNP(s) for the MN, there could be strong restrictions (e.g., not
allowed roaming between operators) about the mechanism described inside this
document.

So, IMHO, additional text is needed regarding this point.

Best regards,

JMC.

</JMC>