Maintained by: NLnet Labs

TCP fallback on timeout

Havard Eidnes
Fri Apr 28 00:50:56 CEST 2017


> 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