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I'm pretty sure this got implemented :)

http://bazaar.launchpad.net/~cloud-init-dev/cloud-init/trunk/revision/1042 
and https://bugs.launchpad.net/cloud-init/+bug/1391695

That's the RHEL support, since cloud-init translates a ubuntu style 
networking style the ubuntu/debian style format should also work.

Steve Gordon wrote:
> ----- Original Message -----
>> From: "Kevin Benton"<blak111 at gmail.com>
>>
>> When we discussed this before on the neutron channel, I thought it was
>> because cloud-init doesn't support IPv6. We had wasted quite a bit of time
>> talking about adding support to our metadata service because I was under
>> the impression that cloud-init already did support IPv6.
>>
>> IIRC, the argument against adding IPv6 support to cloud-init was that it
>> might be incompatible with how AWS chooses to implement IPv6 metadata, so
>> AWS would require a fork or other incompatible alternative to cloud-init in
>> all of their images.
>>
>> Is that right?
>
> That's certainly my understanding of the status quo, I was enquiring primarily to check it was still accurate.
>
> -Steve
>
>> On Thu, Sep 3, 2015 at 7:30 AM, Sean M. Collins<sean at coreitpro.com>  wrote:
>>
>>> It's not a case of cloud-init supporting IPv6 - The Amazon EC2 metadata
>>> API defines transport level details about the API - and currently only
>>> defines a well known IPv4 link local address to connect to. No well known
>>> link local IPv6 address has been defined.
>>>
>>> I usually recommend config-drive for IPv6 enabled clouds due to this.
>>> --
>>> Sent from my Android device with K-9 Mail. Please excuse my brevity.
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>
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