- 550 error for ipv6/PTR ?

Blair Trosper blair.trosper at
Wed Jan 15 03:36:53 UTC 2014

FWIW I do know there was a MASSIVE failure last night around 0800 UTC with
Google's DNS system, and it caused their routing to not only go bat shit
insane, but also for the edge nodes that serve their content to return
largely 503 errors (service unavailable) for several hours.

It wasn't until a few hours ago that the BGP table stabilized.  It was a
horrific mess last night...not sure if perhaps there's still problems
unresolved from that same incident.

On Tue, Jan 14, 2014 at 7:51 PM, Ted Cooper
<ml-nanog090304q at>wrote:

> On 15/01/14 10:06, Brandon Applegate wrote:
> > Off-list replies are fine to minimize noise, and if there is an answer
> > or any meaningful correlation I will reply on-list.  Thanks in advance
> > for any info/feedback.
> I have been running into these a lot also and have so far concluded that
> it is an error within Google. The PTR/AAAA, SPF and DKIM are all matched
> up and tested as working. It also occurring on domains using google apps
> to handle their email so it is platform wide. All of the emails are
> personal emails, but coming from multiple domains/senders.
> The exact same email will be rejected when sent to any google IPv6
> server for minutes/hours, but 3-4 hours later it will be accepted
> without error.
> The fact that it is being hard rejected is really quite annoying and
> generating a lot more support work.
> Unfortunately, my only fix at present is to turn off IPv6 delivery for
> all google hosted domains as I encounter them. It would be really nice
> if it was fixed.
> My theory is that they are failing PTR lookups.

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