Differences Between Recursion Desired and Recursion Available

Mukund Sivaraman muks at isc.org
Fri Oct 6 09:01:23 UTC 2017

On Fri, Oct 06, 2017 at 08:11:56AM +0000, Harshith Mulky wrote:
> What I am not able to understand is, What would happen when resolver
> does not set Recursion Desired bit in the query it sends?
> If Recursion is supported on the server, Would the server do the
> Referral Queries and set the RA bit while sending Response?
> If Recursion is not supported on the server, Would the Referral Query
> fail from the resolver?
> Please can anybody give any pointers in this case?

These can be found in RFC 1034. See 4.3.2 on the nameserver algorithm,
that'll take you to 5.3.3 when RD=1 and the nameserver provides


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