Proxy requests but filter out IPv4 address

[Greg Choules]

Hi Matthias.
In DNS there are many record types. For IP addresses there are two types: A
for IPv4 addresses and AAAA for IPv6 addresses. If your client asks for the
AAAA record it should get only IPv6 addresses. So what is your client
asking for?
Can you show us a real example where both IPv4 and IPv6 addresses are being
returned? pcap would be best.

Cheers, Greg

On Fri, 19 Aug 2022 at 07:56, Matthias Fechner <idefix at fechner.net> wrote:

> Dear all,
>
> I'm not sure if bind can do this, but let me explain what I would like
> to do.
>
> It is a hostname from a foreign domain, like:
> test.myfritz.net
>
> it is returning an IPv4 and IPv6 address:
> host test.myfritz.net
> test.myfritz.net has address 100.91.114.161
> test.myfritz.net has IPv6 address 2a02:6d40:17:9dc7:e228:6dff:fe8d:1f41
>
> The IPv4 address will not work due to carrier-nat, so only the IPv6
> address would be reachable from outside.
>
> Is there a way to configure bind that if I resolve test.myfritz.net (it
> must not be under the domain myfritz.net, but can also be in a way
> aliased to a domain I own) that it only returns the IPv6 address but
> totally skip the IPv4 address?
> The IPv4 and IPv6 addresses are not permanent and change at least once a
> day.
>
>
> Gruß
> Matthias
>
> --
>
> "Programming today is a race between software engineers striving to
> build bigger and better idiot-proof programs, and the universe trying to
> produce bigger and better idiots. So far, the universe is winning." --
> Rich Cook
>
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