Using NAT64 for IPv6 only DNS resolvers

[Mark Andrews]

There is an open issue https://gitlab.isc.org/isc-projects/bind9/-/issues/608
and merge request https://gitlab.isc.org/isc-projects/bind9/-/merge_requests/2166
to do this.

That said you should be asking your OS vendors why they are not providing/enabling
a CLAT implementation.  You could also look at using one of the other IPv4AAS (IPv4
as a service) solutions that doesn’t require manipulating the DNS, nor dual application
layer translation (e.g. DS-Lite, MAP-E).

Mark

> On 16 Mar 2021, at 01:24, Nico Schottelius <nico.schottelius at ungleich.ch> wrote:
> 
> 
> Good morning,
> 
> I was wondering whether it is possible to configure IPv6 only BIND
> resolvers to make use of a NAT64 prefix for outgoing requests?
> 
> I.e. the following situation:
> 
> - Resolver = 2001:db8::1, IPv6 only
> - NAT64 prefix = 2001:db8:1:c001::/96
> 
> Now if bind sees example.com NS a.b.c.d, can we make bind reach out to
> 2001:db8:1:c001::a.b.c.d instead of trying to open up an IPv4 connection
> to a.b.c.d?
> 
> This would be very helpful, as we more and more have IPv6 only hosts,
> which only have access to the Internet via NAT64.
> 
> Note: this is not the same problem as enabling DNS64 for *clients*,
> but very similar.
> 
> Best regards,
> 
> Nico
> 
> 
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-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742              INTERNET: marka at isc.org