[dnsdist] [Pdns-users] dnsdist drops packet

bert hubert bert.hubert at powerdns.com
Mon Jan 4 18:14:34 UTC 2016


On Sat, Dec 19, 2015 at 04:34:11PM +0100, bert hubert wrote:
> Could be, we have the infrastructure to give insight into that but we don't
> make it easy yet:

Hi AleŇ°,

As of right now (the packages that are building now), you can do:

grepq("3000ms")

And get all timeouts. It also shows you which downstream caused the timeout.

> grepq("3000ms")
Time    Client                                          Server       ID    Name                      Type  Lat.   TC RD AA Rcode
-67.0   127.0.0.1:44898                                 8.8.4.4:53   1853  ds9a.com.                 A     3433.1    RD    No Error. 1 answers
-54.5   127.0.0.1:41892                                 8.8.4.4:53   32463 ezdns.it.                 A     T.O             No Error. 0 answers
-49.3   127.0.0.1:41892                                 8.8.4.4:53   32463 ezdns.it.                 A     T.O             No Error. 0 answers
-44.2   127.0.0.1:41892                                 8.8.4.4:53   32463 ezdns.it.                 A     T.O             No Error. 0 answers

Or use topSlow():
> topSlow()
   1  ezdns.it.                                   3 75.0%
   2  ds9a.com.                                   1 25.0%
   3  Rest                                        0  0.0%

You can also do topSlow(10, 4000) to get everything slower than 4000
milliseconds, or even topSlow(10, 4000, 1) which will group everything by
tld.

Can you let us know if this is what you need?

	Bert


> 
> > grepq(".")
> Time    Client                                          ID    Name                      Type  Lat. TC RD AA Rcode
> -25.0   127.0.0.1:59117                                 13086 ds9a.nl.                  A             RD    Question
> -21.2   127.0.0.1:59117                                 0     ds9a.nl.                  A     0.0           No Error. 0 answers
> -20.0   127.0.0.1:59117                                 13086 ds9a.nl.                  A             RD    Question
> -16.2   127.0.0.1:59117                                 0     ds9a.nl.                  A     0.0           No Error. 0 answers
> -15.0   127.0.0.1:59117                                 13086 ds9a.nl.                  A             RD    Question
> -11.2   127.0.0.1:59117                                 0     ds9a.nl.                  A     0.0           No Error. 0 answers
> 
> This "knows" about timeouts to backends, but we don't make it easy to "grep" for them.
> 
> Will add this as a feature.
> 
> 	Bert
> 
> > 
> > Regards
> > Ales
> > 
> > 
> > On Saturday 19 of December 2015 13:20:35 Federico Olivieri wrote:
> > > Hi guys,
> > > 
> > > Nobody has any clue for this? I woukd try to understand why dnsdist shows
> > > some dropped packets. There is any debug that can help me to understand why
> > > it os happen?
> > > 
> > > Thanks and Merry Christmas!!!
> > > 
> > > Federico
> > > 
> > > On 18 Dec 2015 14:22, "Federico Olivieri" <lvrfrc87 at gmail.com> wrote:
> > > > Hi all,
> > > > 
> > > > I have a raspberry that is running dnsdist with this configuration:
> > > > 
> > > > newServer{address="192.168.0.3:53"}
> > > > newServer{address="127.0.0.1:5300", pool="abuse"}
> > > > addPoolRule({"wpad.domain.name"}, "abuse")
> > > > webserver("192.168.0.2:8083", "supersecret")
> > > > addACL("0.0.0.0/0")
> > > > addACL("::/0")
> > > > carbonServer('37.252.122.50', 'raspi-836', 30)
> > > > 
> > > > I don't know why, but on webserver I can see some packets dropped from the
> > > > primary server and I don't understand the reason why. There is not any
> > > > queries rate for that server
> > > > 
> > > > #NameAddressStatusQueriesDropsQPSOutWeightOrderPools0192.168.0.3:53up24108
> > > > 6720111127.0.0.1:5300up10100011abuse
> > > > 
> > > > Do you have any idea why there are some dropped packets?
> > > > 
> > > > Also, I added this line of conf. I could see the queries to goolge but I
> > > > could see also the queries to a.root server. Seems that the command does
> > > > not overwrite the default one. Is it the aspect  behaviour?
> > > > 
> > > > newServer {address="192.168.0.3", checkType="A",
> > > > checkName="www.google.com.", mustResolve=true}
> > > > 
> > > > Last question: I added the carbon server. I can see the server on
> > > > https://metronome1.powerdns.com/ but no one graph is plotted
> > > > 
> > > > Thank you for your time.
> > > > 
> > > > BTW, dnsdist seems very useful and powerful!!!
> > > > 
> > > > Federico
> > 
> 
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> 
> 
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