I completely agree, the only possible explanation would be if they
actually get paid by Google for IPv4 transit (either directly or
indirectly), or somehow use Google's IPv4 traffic as a leverage to pad
the in/out ratios (and/or overall traffic levels) such as to continue
to enjoy settlement-free peering with other transit providers.

C.

On 25 February 2016 at 13:04, Matthew D. Hardeman <[email protected]> wrote:
> What’s truly amazing to me about this is that only Cogent seems to be 
> engaging in this kind of behavior on IPv6.  Furthermore, the only people 
> Cogent is hurting with their willful ignorance of the changing peering 
> landscape in IPv6 is THEIR OWN PAYING CUSTOMERS.  Which is really bizarre 
> when you think about it.  I’m trying to understand this from Cogent’s 
> perspective and failing.  They are creating a problem that impacts only their 
> customers while others do not create this same problem.  How can they imagine 
> this is benefiting them?
>
>
>> On Feb 24, 2016, at 1:53 PM, Max Tulyev <[email protected]> wrote:
>>
>> If you connected to Internet ONLY through Cogent - there is no other
>> way. If you have another upstreams - Google should be reachable.
>>
>> On 24.02.16 21:46, Matt Hoppes wrote:
>>> Correct me if I'm wrong, but if Cogent isn't peering with Google IPv6,
>>> shouldn't the traffic flow out to one of their peer points where another
>>> peer DOES peer with Google IPv6 and get you in?
>>>
>>> Isn't that how the Internet is suppose to work?
>>>
>>>
>>> On 2/24/16 2:43 PM, Damien Burke wrote:
>>>> Not sure. I got the same thing today as well.
>>>>
>>>> Is this some kind of ipv6 war?
>>>>
>>>> -----Original Message-----
>>>> From: NANOG [mailto:[email protected]] On Behalf Of Ian Clark
>>>> Sent: Wednesday, February 24, 2016 10:25 AM
>>>> To: NANOG
>>>> Subject: Cogent & Google IPv6
>>>>
>>>> Anyone know what's actually going on here?  We received the following
>>>> information from the two of them, and this just started a week or so ago.
>>>>
>>>>
>>>> *From Cogent, the transit provider for a branch office of ours:*
>>>>
>>>> Dear Cogent Customer,
>>>>
>>>> Thank you for contacting Cogent Customer Support for information about
>>>> the Google IPv6 addresses you are unable to reach.
>>>>
>>>> Google uses transit providers to announce their IPv4 routes to Cogent.
>>>>
>>>> At this time however, Google has chosen not to announce their IPv6
>>>> routes to Cogent through transit providers.
>>>>
>>>> We apologize for any inconvenience this may cause you and will notify
>>>> you if there is an update to the situation.
>>>>
>>>>
>>>>
>>>> *From Google (re: Cogent):*
>>>>
>>>> Unfortunately it seems that your transit provider does not have IPv6
>>>> connectivity with Google. We suggest you ask your transit provider to
>>>> look for alternatives to interconnect with us.
>>>>
>>>> Google maintains an open interconnect policy for IPv6 and welcomes any
>>>> network to peer with us for access via IPv6 (and IPv4). For those
>>>> networks that aren't able, or chose not to peer with Google via IPv6,
>>>> they are able to reach us through any of a large number of transit
>>>> providers.
>>>>
>>>> For more information in how to peer directly with Google please visit
>>>> https://peering.google.com
>>>>
>>>>
>>>> --
>>>> Ian Clark
>>>> Lead Network Engineer
>>>> DreamHost

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