Comment 61 for bug 1003842

Earlier there was some dispute about what the RFCs say about multiple nameservers.

I found the following RFC which does have something to say about these issues.

    http://www.zoneedit.com/doc/rfc/rfc2182.txt

Here are a couple of passages...

Request for Comments: 2182
Category: Best Current Practice

Selection and Operation of Secondary DNS Servers

Abstract

   The Domain Name System requires that multiple servers exist for every
   delegated domain (zone). This document discusses the selection of
   secondary servers for DNS zones. Both the physical and topological
   location of each server are material considerations when selecting
   secondary servers. The number of servers appropriate for a zone is
   also discussed, and some general secondary server maintenance issues
   considered.

[...]

   With multiple servers, usually one server will be the primary server,
   and others will be secondary servers. Note that while some unusual
   configurations use multiple primary servers, that can result in data
   inconsistencies, and is not advisable.

   The distinction between primary and secondary servers is relevant
   only to the servers for the zone concerned, to the rest of the DNS
   there are simply multiple servers. All are treated equally at first
   instance, even by the parent server that delegates the zone.
   Resolvers often measure the performance of the various servers,
   choose the "best", for some definition of best, and prefer that one
   for most queries. That is automatic, and not considered here.

[...]