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Date:      Tue, 02 Jun 2009 20:50:35 -0400
From:      Steve Bertrand <steve@ibctech.ca>
To:        Chris St Denis <chris@smartt.com>
Cc:        Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>, "freebsd-questions@freebsd.org" <freebsd-questions@freebsd.org>
Subject:   Re: named: error sending response: not enough free resources
Message-ID:  <4A25C8DB.1080908@ibctech.ca>
In-Reply-To: <4A25C613.3070301@ibctech.ca>
References:  <4A25A415.5010502@smartt.com>	<alpine.BSF.2.00.0906030041470.45551@wojtek.tensor.gdynia.pl>	<4A25B309.7000701@smartt.com> <4A25C613.3070301@ibctech.ca>

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Steve Bertrand wrote:
> Chris St Denis wrote:
>> Wojciech Puchar wrote:
> 
>>> possible reasons
>>> - your firewall rules are the cause - check it.
>>    Nope
>>
>>    eureka# ipfw list
>>
>>> - your network card produce problems (REALLY i have that case)
>>    I have had this kind of error on multiple servers over the years, so
>>    i don't think it's a hardware problem.
>>
>>> - the network/LAN named tries to sent UDP packet is somehow flooded.
>>    Dns is probably fairly busy. It's the primary authorative dns for
>>    some busy domains. Is there a setting I can do to increase the
>>    limits of UDP packets to keep it from causing problems?
>>
>>    The server is approaching it's 10 mbps interface speed during peak
>>    hours, I may need to upgrade it to 100mbps.
> 
> The 10Mb ceiling (provided by your ifconfig output) could be a damper on
> this.
> 
> What type of device is em1 attached to? Is it a switch or a hub? Is it
> possible to upgrade this? You should upgrade it to 100 (or 1000)
> anyways. Does this device show any collisions?
> 
> Can you do the following for a few minutes (until at least the problem
> is triggered):
> 
> # tcpdump -n -i em1 proto 17 port 53 -s -w /var/log/dns.pcap

...meh, that should be:

# tcpdump -n -i em1 proto 17 and port 53 -s -w /var/log/dns.pcap

Steve

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