* Henrique de Moraes Holschuh: > On the CDN side, Akamai were warned that their authoritative servers > were broken and would interfere with Qname minimization in February > 2015[1], and it is still not fixed. It is the same bad behavior that > happened to ECN
It is similar to ECN indeed. In both cases, people changed the specification, and complained loudly when their changes are incompatible with the installation base. In fact, the problem with NODATA responses is that it is rather difficult for stub resolvers to tell a NODATA response from a working recursive resolver from a “I don't provide recursive service” response from a non-working recursive resolver. NXDOMAIN would be unambiguous in these situations. It's likely one reason why most implementations moved towards NXDOMAIN in the late 90s.
