[dns-operations] RRL exposed: resolver issues with AAAA-only NS?

[Matthew Pounsett]

On 2013/01/10, at 16:53, Phil Pennock wrote:

> Anyone know of any resolvers that suffer horribly and die when presented
> with an NS host which is AAAA-only?

From the perspective of a v4-only resolver, that would look like a lame delegation.  Is the whole NS set v6-only, or just the one name server?  If it's the whole NS set it wouldn't surprise me to find a few implementations that become a bit pathological about trying to get the address records.  I'd expect those implementations to try resolving the whole NS set though, and give up once they found a v4 address for any of them.