Differences Between Recursion Desired and Recursion Available

Barry Margolin barmar at alum.mit.edu
Fri Oct 6 16:47:11 UTC 2017

In article <mailman.714.1507277541.702.bind-users at lists.isc.org>,
 Harshith Mulky <harshith.mulky at outlook.com> 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 RD is not set, the server should simply not recurse. It answers with 
whatever it has in its cache or authoritative data. If it has the 
answer, it sends that; otherwise, if it has referral data, it sends that.

Barry Margolin
Arlington, MA

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