UDP packet loss
Pavel Urban
urbanp at mlp.cz
Fri Jun 9 05:29:05 UTC 2006
Danny Mayer wrote:
> Pavel Urban wrote:
>> Patrick Klos wrote:
>> > In article <e69ccs$cbm$1 at sf1.isc.org>, Pavel Urban <urbanp at mlp.cz>
>> wrote:
>> >> Hello,
>> >>
>> >> I've tried to find out the cause of some strange resolving problem
>> we are experiencing. From time to time, our server seems to ignore some
>> requests, while others are answered promptly. It seems to me that the
>> problem is UDP packet loss.
>> >>
>> >> Udp:
>> >> 948795842 packets received
>> >> 149802 packets to unknown port received.
>> >> 214635022 packet receive errors
>> >> 1003702082 packets sent
>> >>
>> >> I've tried to increase system udp receive buffer 10x and then 100x
>> with no noticable effect. Do I have to change something in Bind, too? Or
>> am I completely wrong?
>> >
>> > I'd say your biggest problem is the 214 million packet receive errors!
>> > Find the source of those errors, and you'll likely take care of your
>> > problem. Your machine is tossing 1 out of every 4 or 5 packets!
>> >
>>
>> I've tried to 'watch' these errors and they seem to be bind-related -
>> after the service is restarted, these errors stop to occur for some
>> time. I thought that the cause is small udp receive buffer, but I'm not
>> a network specialist - do you think it is/may be caused by something else?
>>
>> Thanks!
>>
>
> Which O/S and which version of BIND?
>
> Danny
>
Sorry, this post went initially to bind-users at isc.org; by replying to
it, it ended up in 'comp-protocols-dns-bind at isc.org'. I've probably
messed up threads a bit.
As I've stated in my original post, it is
RedHat Linux ES release 4, 2.6.9-34.ELsmp kernel, dual Opteron system
with 6GB ram, no local zones, just resolver/cache. bind-9.3.2-2_EL4
Thanks!
--
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Pavel Urban (pavel.urban at imaginet.cz)
IOL system disaster
Internet OnLine, owned by Cesky Telecom, a.s. (www.ct.cz)
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Vegetables should not operate electronic equipment.
Computer Stupidities, http://rinkworks.com/stupid/
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