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
 
<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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> On 4 Feb 2017, at 11:03, Benoit Panizzon <paniz...@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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