That's a Let's Encrypt rather than an ACME one, but to answer for Let's
Encrypt: soon! We're working on it. Followup to
https://community.letsencrypt.org/ if you have more questions?

Thanks,
Jacob

On 12/11/2015 02:17 PM, Thomas Lußnig wrote:
> Hi,
>
> are there any information when DNS challenge will be available ?
>
> Gruß Thomas
>
> Am 11.12.2015 um 23:03 schrieb Jacob Hoffman-Andrews:
>> On 12/11/2015 12:50 PM, Michael Wyraz wrote:
>>> I'm new to this mailing list. Today I started a discussion on IRC about
>>> the fact that ACME with http-01 won't work if the A record points to an
>>> intranet IP address
>> In general, publicly trusted CAs are supposed to verify that a name is
>> available on the public Internet.
>>
>>> or is resolved dynamically dependent on geo locations or similar.
>> This is a potential issue, and is similar to recently discussed issue
>> about choosing from multiple available IPs, but is a harder problem to
>> solve. If you push a challenge to just one geo region, a validation
>> attempt from a different geo region may not see any relevant IPs.
>>
>>> The idea to solve these issues is simple: why not using some special
>>> dns
>>> record to resolve an URL that is responsible for ACME-challenges for a
>>> certian domain? This is more flexible than building the URL based on
>>> A-Record on a fixed scheme.
>> If you're willing to accept a dependency on DNS, it makes sense to just
>> use the DNS challenge instead. I think that's probably the ideal
>> solution for services that have many frontends and do geo load
>> balancing.
>>
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