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Date: Wed, 3 Jun 2009 11:48:48 +0200 (CEST)
From: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
To: Mel Flynn <mel.flynn+fbsd.questions@mailing.thruhere.net>
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Cc: Chris St Denis <chris@smartt.com>, freebsd-questions@freebsd.org
Subject: Re: named: error sending response: not enough free resources
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>>
>> possible reasons
>> - your firewall rules are the cause - check it.
>> - your network card produce problems (REALLY i have that case)
>> - the network/LAN named tries to sent UDP packet is somehow flooded.
>  - the network card changes from UP to DOWN state at the time of the error
>
> See that a lot running local resolver on a wireless-g card and turning on the
> microwave.
this is extreme case. but card don't need to turn UP and DOWN for long 
enough for system to get a message. my second case
>> - your network card produce problems (REALLY i have that case)

is an example. i had such card that just reported error every some amount 
of packets.