Re: [DMM] WGLC for draft-ietf-dmm-ondemand-mobility-08

Hi,

I like the goal of reducing network cost by allowing the use of IP
addresses that do not require network mobility, but we should not be doing
this by requesting IP addresses from the network, because this violates
IPv6 address assignment best practices.

Specifically, RFC 7934 recommends that a) the network should provide
multiple addresses from each prefix and b) the network should allow the
host to use new addresses without requiring explicit requests to the
network. This is in conflict with at least this text in the draft, which
says:

   In case an application
   requests one, the IP stack shall make an attempt to configure one by
   issuing a request to the network.  If the operation fails, the IP
   stack shall fail the associated socket request

One way to resolve this conflict would be to say that the network must not
assign individual addresses, but /64 (or shorter) prefixes. So if the
device desires to use fixed IPv6 addresses, then the network should give
the host a fixed IPv6 prefix from which the host can form as many addresses
as it wants.

I do not think we should advance this document until the conflicts are
resolved. This document is about IPv6 address assignment to mobile nodes,
and we should not publish a document about IPv6 address assignment that
conflicts with best current practices on IPv6 address assignment.

Regards,
Lorenzo

On Mon, Nov 28, 2016 at 12:56 PM, jouni.nospam <jouni.nospam@gmail.com>
wrote:

> Folks,
>
> The authors of draft-ietf-dmm-ondemand-mobility-07
> and draft-sijeon-dmm-use-cases-api-source have come up with a merged
> document draft-ietf-dmm-ondemand-mobility-08.
>
> This email starts a 2 week WGLC for draft-ietf-dmm-ondemand-mobility-08.
> The WGLC starts 11/28/16 and ends 12/12/16.
>
> Provide your comments, concerns and approvals to the email list (and
> hopefully also to IssueTracker).
>
> - Jouni & Dapeng
>
>
>
> Begin forwarded message:
>
> *From: *IETF Secretariat <ietf-secretariat-reply@ietf.org>
> *Subject: **IETF WG state changed for draft-ietf-dmm-ondemand-mobility*
> *Date: *November 28, 2016 at 12:51:34 PM PST
> *To: *<draft-ietf-dmm-ondemand-mobility@ietf.org>, <dmm-chairs@ietf.org>,
> <max.ldp@alibaba-inc.com>
> *Resent-From: *<alias-bounces@ietf.org>
> *Resent-To: *jouni.nospam@gmail.com, maxpassion@gmail.com
>
>
> The IETF WG state of draft-ietf-dmm-ondemand-mobility has been changed to
> "In WG Last Call" from "WG Document" by Jouni Korhonen:
>
> https://datatracker.ietf.org/doc/draft-ietf-dmm-ondemand-mobility/
>
>
> Comment:
> WGLC starts 11/28/16 and ends 12/12/16.
>
>
>
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