[dns-operations] IPv6 only for nameservers

[Jared Mauch]

While I would not recommend this generally there are a few of us that operate free secondary services that are dual stacked. Make sure one NS is dual stacked and you are likely fine. 

Sent from my iCar

> On Dec 31, 2019, at 4:47 AM, Shane Kerr <shane at time-travellers.org> wrote:
> 
> Stephane and all,
> 
>> On 30/12/2019 16.01, Stephane Bortzmeyer wrote:
>> On Mon, Dec 30, 2019 at 05:18:01PM +0300,
>>  Anand Buddhdev <anandb at ripe.net> wrote
>>  a message of 17 lines which said:
>>> If your domain's authoritative name servers have only IPv6
>>> addresses, then your domain will not be resolvable by many resolvers
>>> on the Internet, because many of them only have IPv4 connectivity.
>> This was in 2014 but I'm not sure it changed a lot since:
>> https://labs.ripe.net/Members/stephane_bortzmeyer/how-many-ripe-atlas-probes-can-resolve-ipv6-only-domain-names
> 
> I just re-ran a similar test and got about a 71% success rate:
> 
> https://atlas.ripe.net/measurements/23732712/
> 
> While technically slightly better than 67% success rate measured 5 years ago, to me this means that running an IPv6-only name server it is basically not possible.
> 
> I also ran a version using IPv6-enabled probes, and got an 89% success rate:
> 
> https://atlas.ripe.net/measurements/23734035
> 
> I think that even 90% is still not good enough to allow you to run an IPv6-only name server, at least for general Internet usage. 😞
> 
> Cheers,
> 
> --
> Shane
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