UDP packet loss

Pavel Urban pupu at pupu.cz
Thu Jun 8 15:45:11 UTC 2006

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?


Pavel Urban (pavel.urban at imaginet.cz)
IOL system disaster
Internet OnLine, owned by Cesky Telecom, a.s. (www.ct.cz)
    Vegetables should not operate electronic equipment.
           Computer Stupidities, http://rinkworks.com/stupid/

More information about the bind-users mailing list