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Re: [DNSOP] [dnsext] Re: Computerworld apparently has changed DNS protocol

Duane Wessels <wessels@dns-oarc.net> Wed, 11 November 2009 06:28 UTC

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Date: Wed, 11 Nov 2009 06:29:19 +0000
From: Duane Wessels <wessels@dns-oarc.net>
To: Nicholas Weaver <nweaver@ICSI.Berkeley.EDU>
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Subject: Re: [DNSOP] [dnsext] Re: Computerworld apparently has changed DNS protocol
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On Wed, 4 Nov 2009, Nicholas Weaver wrote:

> Also, has someone done a study what the major recursive resolvers do on 
> response failures from a root?  Do they go to another first or do they try a 
> smaller EDNS MTU?

I gave a presentation on this at the DNS-OARC meeting last week:

https://www.dns-oarc.net/files/workshop-200911/Duane_Wessels.pdf

I was only able to test BIND (9.4.3) and Unbound (1.3.3) before the
workshop.

I've since learned that since my graphs only show 7 seconds after
the initial query, it misses Unbound's fallback to TCP, which
takes longer than that.

Duane W.

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