[Pdns-users] Missing Answers RR in some response

[Vu Le]

On Sat, Jul 26, 2014 at 11:50 AM, Vu Le <lev.fpt at gmail.com> wrote:
> I have checked the with test engineer and confirmed that the query
> packet is the same for both successful and unsuccessful query (we dit
> the packet capture). The server was serving some client at the time of
> testing therefore invalid packet may come from these clients. I will
> isolate the server and run the test again.
>
> The packet capture of this test is uploaded here for further investigation:
> https://dl.dropboxusercontent.com/u/1932762/test-pdns-recursor.pcap  (350KB)
>
> Vu.
>
> On Fri, Jul 25, 2014 at 5:30 PM, abang <abang at t-ipnet.net> wrote:
>> Am 25.07.2014 02:06, schrieb Vu Le:
>>
>> #tail /var/log/messages
>> Jul 24 17:59:50 SERVER pdns_recursor[13859]: Error processing or aging
>> answer packet: out of bounds: 16 >= 16
>>
>> This is an exception in doProcessUDPQuestion:
>>
>> https://github.com/PowerDNS/pdns/blob/master/pdns/pdns_recursor.cc#L893
>>
>> May be the Spirent testcenter sends sometimes invalid query packets?
>>
>> Winfried


Hi! I figured out the problem. The default setting in the testcenter
send a query with Recursion Desired bit equal to zero. When I re-run
the test with Recursive = yes, the box easily handle 100K qps.

Vu.