named: error sending response: not enough free resources

Steve Bertrand steve at
Wed Jun 3 00:54:54 UTC 2009

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



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