The permuted case serves a well documented purpose and will not generate duplicate cache entries.
See this document explaining it: https://indico.dns-oarc.net/event/20/session/2/contribution/12/material/slides/0.pdf

Andreas Fink

Fink Telecom Services, Rackbone.ch, Cajutel.com
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Mobile: +41-78-6677333 Skype: andreasfink Jabber/XMPP: andreas@fink.org
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On 4 Feb 2017, at 11:03, Benoit Panizzon <panizzon@woody.ch> wrote:

Hello All

Anyone else running bind9 and seeing a lot of request with permuted
case in the requested resource, which I fear causes bind9 to cache
each reply individually leading to memory exhaustion?

-BenoƮt-


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