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Date:      Tue, 02 Jun 2009 20:55:03 -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:  <4A25C9E7.9050000@ibctech.ca>
In-Reply-To: <4A25C8DB.1080908@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> <4A25C8DB.1080908@ibctech.ca>

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Steve Bertrand wrote:
> 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

Ok. Perhaps I'm getting too old to try to recollect from memory. One
more try (tested ;)

pearl# tcpdump -n -i em1 -s 0 -w /var/log/dns.pcap port 53 and proto 17

Sorry!

Steve


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