TCP fallback on timeout

[Havard Eidnes]

> Unfortunately, DNS servers aren't required to support TCP.

IMHO, that is an all too commonly held misconception.  Publishing name
servers need to support TCP as well.  I'm pretty sure section 4.2 of
RFC 1035 mandates it.  It doesn't use the formal requirements keywords
because it predates the RFC which defined their use in this document
series.

Regards,

- Håvard