[NOC] ARIN contact needed: something bad happens with legacy IPv4 block's reverse delegations

Bjørn Mork bjorn at mork.no
Fri Mar 17 16:42:11 UTC 2017

William Herrin <bill at herrin.us> writes:
> On Fri, Mar 17, 2017 at 7:52 AM, Romeo Zwart <rz+nng at zwart.com> wrote:
>> RIPE NCC have issued a statement about the issue here:
>>  https://www.ripe.net/ripe/mail/archives/dns-wg/2017-March/003394.html
>> Our apologies for the inconvenience caused.
> Hmm. That sounds like an ARIN-side bug too. ARIN's code responded to
> corrupted data by zeroing out the data instead of using the last known good
> data. That's awfully brittle for such a critical service.

Well, it was a nice smoke test of the "RDNS required" anti-feature.  All
of a sudden we couldn't even send email to ourselves, having smarthosts
in one of the affected zones. Nice.

Maybe time to re-evaluate the usefulness of that config...


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