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Re: [DNSOP] On resolver priming

"W.C.A. Wijngaards" <wouter@NLnetLabs.nl> Fri, 12 November 2010 15:46 UTC

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Date: Fri, 12 Nov 2010 16:46:47 +0100
From: "W.C.A. Wijngaards" <wouter@NLnetLabs.nl>
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Subject: Re: [DNSOP] On resolver priming
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Hi,

On 11/11/2010 07:49 PM, Matt Larson wrote:
> On Thu, 11 Nov 2010, Andrew Sullivan wrote:
>> argument by just signing the data.
>
> That's simply the conservative, operationally prudent course of
> action.

I suspect there is cause to be conservative.  Thus, I have performed a
test with BIND 9.7.1 and NSD 3.2.6, signing root-servers.net (test
RSASHA256 2048 ksk and 1024 zsk).  And checked the response sizes for
the prime query and a query to a.root-servers.net.  These results:

. NS (BIND): 4525
. NS (NSD): 829 (unchanged from today)

a.root-servers.net A (BIND): 4557
a.root-servers.net A (NSD): 4575

The difference for a.root-servers.net is because of compression
implementation, and on UDP most likely would be cut off at 40xx.  The
prime response from BIND includes the RRSIGs over the root server A and
AAAA records (at 164 bytes data each, 21 times).

This is of course a very quick test, and details would need a serious
investigation.

Best regards,
   Wouter
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