Re: [v6ops] Clarification/addition on the cpe-slaac doc.

Fernando Gont <fgont@si6networks.com> Wed, 10 February 2021 19:02 UTC

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To: Warren Kumari <warren@kumari.net>, "Bernie Volz (volz)" <volz@cisco.com>
Cc: IPv6 Operations <v6ops@ietf.org>
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From: Fernando Gont <fgont@si6networks.com>
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Date: Wed, 10 Feb 2021 15:19:53 -0300
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Subject: Re: [v6ops] Clarification/addition on the cpe-slaac doc.
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Hi, Warren,

On 10/2/21 14:50, Warren Kumari wrote:
> 
> 
> On Wed, Feb 10, 2021 at 10:37 AM Bernie Volz (volz) <volz@cisco.com 
> <mailto:volz@cisco.com>> wrote:
> 
[....]
> 
> Perhaps we should just clarify that this document just draws attention 
> to requirements in 8415, and doesn't replace it (which should be 
> obvious, but I agree may be worth doing).

FWIW, something along these lines could be used for the content of the 
subsection that elaborates on the requirement:

    [RFC8415] requires that IAID for an IA MUST be consistent across
    restarts of the DHCP client. However, some popular CE Routers are
    known to select a new random IAIDs e.g. everytime the underlying PPP
    session is established. This could be the result of extrapolating the
    behavior described in [RFC7844], or simply a consequence of not
    storing the IAID on stable storage and failing to employ an algorithm
    that consistently generates the same IAID upon reboots. Thus, this
    requirement prevents CE Routers from inadvertently triggering a
    flash-renumbering event on the local network.


Tweaks welcome :-)

Thanks,
-- 
Fernando Gont
SI6 Networks
e-mail: fgont@si6networks.com
PGP Fingerprint: 6666 31C6 D484 63B2 8FB1 E3C4 AE25 0D55 1D4E 7492