Message-Id: <6.2.5.6.2.20260703113719.0a391288@elandnews.com>
Date: Fri, 03 Jul 2026 12:19:55 -0700
To: Franck Martin <franck@peachymango.org>, Gert Doering <gert@space.net>,
        v6ops@ietf.org
From: S Moonesamy <sm+ietf@elandsys.com>
In-Reply-To: <02C55ACD-BD85-4002-BABD-5159836C9306@peachymango.org>
References: <B87CF61D-7435-4BE8-9E17-44BD7CDFECFE@peachymango.org>
 <02C55ACD-BD85-4002-BABD-5159836C9306@peachymango.org>
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Subject: =?utf-8?q?=5Bv6ops=5D_Re=3A_SMTP_IPv4_outage_1_July?=
Archived-At: 
 <https://mailarchive.ietf.org/arch/msg/v6ops/KseRpIh2LqJoNxlo8rq977nLKug>

Hi Franck, Gert,
At 09:53 AM 03-07-2026, Franck Martin wrote:
>I forgot to add, not knowing the case here, that=20
>it is important to monitor a service over each=20
>IP family to avoid regressions during IPv6=20
>deployment. It is mentioned in the data center draft.
>
>IPv4 outages are also great to send the message,=20
>if we get rid of IPv4 the impact is likely to be=20
>minimum, and not the end of the world, like some would like you to believe=
=85

At 11:07 AM 03-07-2026, Gert Doering wrote:
>As long as the service has working IPv6, a failure on the IPv4 side should
>be most uninteresting to people using this modern Internet thing...
>
>It does emphasize the point that dual-stack without proper monitoring
>of both stacks is a major annoyance.

The outage report included 14.3% of corporate=20
fluff; a similar test on an announcement from=20
another region scored 82%.  The lack of=20
monitoring, in this case, caused the IPv4 service=20
outage to go undetected for over half a day.  It=20
could also happen to the IPv6 service is that=20
service is not properly monitored.  The annual=20
cost to run a monitoring script on a virtual=20
machine would be less than EUR 100.

I sent an email to government agency a few weeks=20
ago.  I guess that I was the only person who=20
noticed that the web service, advertised as dual=20
stack, was not responding to requests over IPv6.

Regards,
S. Moonesamy=20