Same Transaction ID queries

2012-02-04 Thread Samer Khattab
Hi all,

We have an observation for some queries where BIND caching server receives
multiple queries (three or four,  A or ) for a domain name, with the
same transaction ID in the DNS header in all query packets, and one
response packet is sent back from the server only for these queries.

The client IP,source port and Server IP is the same in these queries.

Is this the right BIND behavior in this case or it is an issue.


Regards,
Samer Khattab
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Re: Same Transaction ID queries

2012-02-04 Thread Samer Khattab
What is BIND internal logic when such a series of queries are received, and
why it would not answer to all requests.

Regards,
Samer Khattab


On Sun, Feb 5, 2012 at 9:42 AM, Mark Andrews ma...@isc.org wrote:


 In message CAH14rHi==V=BG4AZUGTuO0m7ruQC+WiK3hRko=
 oky1lepdf...@mail.gmail.com
 , Samer Khattab writes:
  Hi all,
 
  We have an observation for some queries where BIND caching server
 receives
  multiple queries (three or four,  A or ) for a domain name, with the
  same transaction ID in the DNS header in all query packets, and one
  response packet is sent back from the server only for these queries.
 
  The client IP,source port and Server IP is the same in these queries.
 
  Is this the right BIND behavior in this case or it is an issue.

 It is expected behavior.

  Regards,
  Samer Khattab
 --
 Mark Andrews, ISC
 1 Seymour St., Dundas Valley, NSW 2117, Australia
 PHONE: +61 2 9871 4742 INTERNET: ma...@isc.org

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Re: maximum number of FD events (64) received

2010-09-27 Thread Samer Khattab
Thanks Sergey,

I want to know one more thing, if you can help me.

Will this error cause timeouts ? does it have impact on performance ?



On Mon, Sep 27, 2010 at 3:42 PM, Sergey V. Lobanov ser...@lobanov.inwrote:

 Reconfigure Bind thus:

 STD_CDEFINES='-DISC_SOCKET_MAXEVENTS=256' ./configure --your-options

 then recompile


 On 09/27/2010 01:27 PM, Samer Khattab wrote:

 Hi all,

 I'm using Bind as a caching name server and serving around 2000 req per
 second, and recently have the following messages showing up from time to
 time in the general.log.


 27-Sep-2010 10:45:47.639 sockmgr 0x2ad7af2f5010: maximum number of FD
 events (64) received
 27-Sep-2010 10:45:47.872 sockmgr 0x2ad7af2f5010: maximum number of FD
 events (64) received

 BIND BIND 9.7.1-P2
 RHEL 5.5   kernel 2.6.18-194.11.3.el5

 What is the meaning of these messages ? Are they related to the system
 file descriptors ?



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 --
 wbr,
 Sergey V. Lobanov


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BIND 9.7.1-P2 caching name server crash

2010-08-29 Thread Samer Khattab
Bind suffered from a crash on one of our caching servers, a core dumb for
named was generated.

We are running BIND 9.7.1-P2, on rhel 5.5, kernel 2.6.18-194.el5.

The only useful log lines found at the crash time are from general.log,
following are the lines:

27-Aug-2010 16:43:04.901 query.c:1784: INSIST(!
dns_rdataset_isassociated(sigrdataset)) failed, back trace
27-Aug-2010 16:43:04.907 #0 0x41128b in assertion_failed()+0x4b
27-Aug-2010 16:43:04.907 #1 0x552e6a in isc_assertion_failed()+0xa
27-Aug-2010 16:43:04.907 #2 0x4180d1 in query_addadditional2()+0x1181
27-Aug-2010 16:43:04.907 #3 0x4b64df in dns_rdata_additionaldata()+0x12f
27-Aug-2010 16:43:04.907 #4 0x4e3a9b in dns_rdataset_additionaldata()+0xdb
27-Aug-2010 16:43:04.907 #5 0x414c73 in query_addrrset()+0x253
27-Aug-2010 16:43:04.907 #6 0x418ef5 in query_find()+0xdd5
27-Aug-2010 16:43:04.907 #7 0x41c23b in query_resume()+0x1fb
27-Aug-2010 16:43:04.907 #8 0x56cfcc in run()+0x1dc
27-Aug-2010 16:43:04.907 #9 0x3951a0673d in _fini()+0x3951486f75
27-Aug-2010 16:43:04.913 #10 0x39512d3d1d in _fini()+0x3950d54555
27-Aug-2010 16:43:04.913 exiting (due to assertion failure)


Any advice on this fault ?

Thanks in advance
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