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Some thought has been given to this. See
https://bugs.launchpad.net/neutron/+bug/1460177

I like the third option, a well-known name using DNS.

On Thu, Sep 03, 2015, Kevin Benton <blak111 at gmail.com> wrote:
> I think that's different than what is being asked here. That patch appears to
> just add IPv6 interface information if it's available in the metadata. This
> thread is about getting cloud-init to connect to an IPv6 address instead of
> 169.254.169.254 for pure IPv6 environments.
>
> On Thu, Sep 3, 2015 at 11:41 AM, Joshua Harlow <harlowja at outlook.com
> <mailto:harlowja at outlook.com>> wrote:
>
>     I'm pretty sure this got implemented :)
>
>     http://bazaar.launchpad.net/~cloud-init-dev/cloud-init/trunk/revision/1042
>     <http://bazaar.launchpad.net/%7Ecloud-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 <mailto: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
>             <mailto: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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>
>
> -- 
> Kevin Benton
>
>
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