BIND 9.11.4 dnstap not capturing updates

greg.rabil at greg.rabil at
Thu Aug 2 20:34:24 UTC 2018

Hello BIND users,
(my apologies if this gets posted twice, I first sent to bind-users at<mailto:bind-users at> instead of bind-users at<mailto:bind-users at>)

I am running BIND 9.11.4 on CentOS 7, built with support for dnstap.  I am testing capturing of all DNS packets, including DNS update packets, but they don't seem to be captured.  Here are my named.conf options:

   dnstap-output   file "/tmp/dnstap.output"   ;
   dnstap {   all  ; };

I use nsupdate to send a DDNS update to my zone, which is added successfully.  However, the dnstap.output does not record the DNS update.  I see only the following three packets captured:

02-Aug-2018 16:24:37.365 AQ ::1:8145 -> ::1:0 UDP 38b
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id:  18817
;          IN      SOA

02-Aug-2018 16:24:37.365 AR ::1:8145 <- ::1:0 UDP 104b
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id:  18817
;; flags: qr aa ra; QUESTION: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0
;          IN      SOA

;; AUTHORITY SECTION:         0       IN      SOA     centos7-dns-test1. 6 10800 3600 604800 86400

02-Aug-2018 16:24:37.367 AR ::1:8145 <- ::1:0 UDP 32b
;; ->>HEADER<<- opcode: UPDATE, status: NOERROR, id:  22809
;; flags: qr; ZONE: 1, PREREQ: 0, UPDATE: 0, ADDITIONAL: 0
;                        IN      SOA

Why is the DNS Update packet not captured/logged?

Greg Rabil

A. Gregory Rabil | Principal Software Architect| BT Diamond IP |
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