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[v6ops] A broken promise - "You said PD Prefix Valid Lifetime is going to be X" (Re: SLAAC renum: Problem Statement & Operational workarounds)

Mark Smith <markzzzsmith@gmail.com> Wed, 30 October 2019 23:39 UTC

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From: Mark Smith <markzzzsmith@gmail.com>
Date: Thu, 31 Oct 2019 10:38:41 +1100
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To: Ole Troan <otroan@employees.org>
Cc: Ted Lemon <mellon@fugue.com>, v6ops list <v6ops@ietf.org>
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Subject: [v6ops] A broken promise - "You said PD Prefix Valid Lifetime is going to be X" (Re: SLAAC renum: Problem Statement & Operational workarounds)
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On Wed, 30 Oct 2019 at 22:02, Ole Troan <otroan@employees.org> wrote:
>
<snip>

> In the case when a requesting router loses a prefix, it can of course signal that to the hosts as proposed in Fernando's draft. But that doesn't solve the general problem, and I'm skeptical to using addressing as a reachability signal. E.g. if the CPE's upstream link flaps, is that enough to trigger deprecation of the prefix? Of course it shouldn't.
>

Exactly. Transient network faults are supposed to be survived - that's
why TCP makes quite a number of attempts at re-transmitting when
packet loss occurs, rather than just immediately terminating the
connection.

When an ISP "flash renumbers" a customer what's really happening is
that the customer's network layer point of attachment to the network
is being changed - the customer is being abruptly disconnected, moved
and re-connected. Possibly that is easy to overlook because the
customers physical location and their physical link to the network
doesn't change.

I think Ole observed that this is contrary to what the PD prefix's
Valid Lifetime said would be the case. The ISP supplied a PD Prefix
with a Valid Lifetime of X seconds, and then broke that promise by
abruptly changing addressing before X seconds. ISPs should be expected
to live up to their Valid Lifetime promises.

Regards,
Mark.


> Ole
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> v6ops mailing list
> v6ops@ietf.org
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