[dns-operations] TC=1 with RA=0 from a recursive resolver

[Florian Weimer]

* Mark Andrews:

> That's what RFC 1034 says.
>
>    - The recursion available, or RA bit, is set or cleared by a
>      name server in all responses.  The bit is true if the name
>      server is willing to provide recursive service for the client,
>      regardless of whether the client requested recursive service.
>      That is, RA signals availability rather than use.
>
> If RD effects RA then the server is broken.

But RFC 1034 does not reflect current practice.