[dns-operations] Errors in Querying quad-A records

[Praveen Misra]

Hi 


I am not sure this is the right forum but most of you folks are experts in DNS and maybe able to help. My apologies


We are doing some experimentation on the behavior of the DNS response to queries by simulating a few thousand devices in containers. 


When we send AAAA queries from about 3000 devices (each running on docker containers with unique global unicast IPv6 addresses) continuously to the authoritative name server, we have observed the following



26-Sep-2019 13:47:47.217 socket.c:1739: unexpected error: 26-Sep-2019 13:47:47.217 internal_send: 2405:8a00:4001:17:cf69::ce#43084: Invalid argument 26-Sep-2019 13:47:47.217 client @0x7f03ac352da0 2405:8a00:4001:17:cf69::ce#43084 (7e60e9fc93458393e43e0c23985203bfd0d6627420289a8f9c863771.iith.ipv6.ernet.in(http://7e60e9fc93458393e43e0c23985203bfd0d6627420289a8f9c863771.iith.ipv6.ernet.in/)): error sending response: invalid file 

Output logged in the rndc shows that there were 704326 UDP/IPv6 send errors:



++ Name Server Statistics ++  2520563 IPv6 requests received  2520563 responses sent  2520563 queries resulted in successful answer  2520563 queries resulted in authoritative answer  2520563 UDP queries received  


++ Socket I/O Statistics ++  157 UDP/IPv4 sockets opened  97 UDP/IPv6 sockets opened  2 TCP/IPv4 sockets opened  38 TCP/IPv6 sockets opened  1 Raw sockets opened  102 UDP/IPv4 sockets closed  42 UDP/IPv6 sockets closed  137 TCP/IPv6 sockets closed  102 UDP/IPv4 socket connect failures  41 UDP/IPv6 connections established  35 TCP/IPv6 connections established  1 TCP/IPv4 connections accepted  102 TCP/IPv6 connections accepted  102 UDP/IPv4 send errors  704326 UDP/IPv6 send errors  46 TCP/IPv6 send errors  1 TCP/IPv6 recv errors  55 UDP/IPv4 sockets active  55 UDP/IPv6 sockets active  3 TCP/IPv4 sockets active  3 TCP/IPv6 sockets active  1 Raw sockets active 

Used BIND 9.14.6 (Stable Release) <id:efd3496>

running on Linux x86_64 4.15.0-64-generic #73~16.04.1-Ubuntu SMP Fri Sep 13 09:56:18 UTC 2019 built by make with '--with-libxml2' compiled by GCC 5.4.0 20160609 compiled with OpenSSL version: OpenSSL 1.0.2g 1 Mar 2016 linked to OpenSSL version: OpenSSL 1.0.2g 1 Mar 2016 compiled with libxml2 version: 2.9.3 linked to libxml2 version: 20903 compiled with zlib version: 1.2.8 linked to zlib version: 1.2.8 threads support is enabled  default paths:  named configuration: /etc/named.conf  rndc configuration: /etc/rndc.conf  DNSSEC root key: /etc/bind.keys  nsupdate session key: /var/run/named/session.key  named PID file: /var/run/named/named.pid  named lock file: /var/run/named/named.lock 

I searched and found that similar issue has been raised previously and were claimed to have been fixed. I also observe that the suggested fix has been incorporated in the current BIND 14. However the error remains. 

We have already raised this issue with ISC also but was wondering if someone in this forum came across this issue or can throw some insight to the probable cause of the error and provide some suggestions to solve this issue. 
 

-- 

Regards    भवदीय 
Praveen Misra    प्रवीण मिस्र 
Addl. Director (IPv6, AI & Accessibility) ,    अतिरिक्त निदेशक (IPv6, कृत्रिम बुद्धिमत्ता एवं सुगमता)
ERNET India     ई॰आर॰नेट इंडिया 
(Ministry of Electronics & IT, Govt of India) (इलेक्ट्रॉनिक्स एवं सूचना प्रद्योगिकी मंत्रालय, भारत सरकार)
6, CGO Complex,Lodhi Road    6 सी॰जी॰ओ कॉम्प्लेक्स, लोदी रोड
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Phone: +91-11-22170595    दूरभाष: +91-11-22170595
Mobile: +91-98189 55800    मोबाइल: +91-9818955800
Skype: misrapraveen   www.ipv6.ernet.in
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