[98378] in North American Network Operators' Group
Re: large organization nameservers sending icmp packets to dns servers.
daemon@ATHENA.MIT.EDU (Joe Abley)
Mon Aug 6 17:54:54 2007
In-Reply-To: <46B78524.9000501@peter-dambier.de>
Cc: nanog@nanog.org
From: Joe Abley <jabley@ca.afilias.info>
Date: Mon, 6 Aug 2007 17:53:38 -0400
To: peter@peter-dambier.de
Errors-To: owner-nanog@merit.edu
On 6-Aug-2007, at 16:31, Peter Dambier wrote:
> John L wrote:
>> Um, unless I seriously misunderstand the client DNS cache wants to
>> know which server is closest. So it sends DNS queries to all
>> three NS at the same time. Then it waits for the answers.
>> Whichever one answers first is the closest. What am I missing?
>
> The bind_garbadge_collection_delay.
>
> From time to time bind goes to sleep, depending on the size
> and number of zones the nameserver does host.
I think you're talking about the performance of BIND 9 as a cache.
This is pretty tangential, but there was a good presentation on work
being done to fix that performance problem by Michael Graff at the
recent DNS ops workshop in Chicago:
http://public.oarci.net/files/dnsops-2007/Graff-BIND9-cache.pdf
Joe
