[CentOS] Slightly OT: DNS -force client always use authoritative

Fri Dec 22 19:03:03 UTC 2006
Les Mikesell <lesmikesell at gmail.com>

On Fri, 2006-12-22 at 08:25 -0800, Jeff Lasman wrote:

> > More such that the client can cache it, but not a 'server in
> > between', *only* the authoritative box...  Hopefully that makes
> > sense, i'm basically asking on behalf of our CTO and just mentioned
> > your question...  The answer to which is yes, trying to not use
> > cached lookups....  Trying to pick through the proposals and
> > determine what it is they (ultradns and Savvis ITM features are
> > relying on)...
> So what you want to do is for _every_ lookup not already in your cache 
> you'd want to do separate non-recursive lookups at each nameserver (try 
> the "dig +trace example.com" command to see what I mean) instead of one 
> recursive lookup?
> Sure if you can find or write a resolver that'll ask the nameservers the 
> right questions; it's got nothing to do with the DNS servers; they just 
> supply (or fail to supply) the record they're asked for.
> You can ask the question on bind-users but be prepared to be flamed.

This is a fairly anti-social thing to do since you'll be unnecessarily
bothering the authoritative servers (and probably walking down to them
from the root servers) for every answer instead of using the caching
infrastructure designed and put in place to avoid this load.

  Les Mikesell
   lesmikesell at gmail.com