[dsc] Filter DSC statistiks according to TLD / SLD

Jerry Lundström jerry at dns-oarc.net
Tue Apr 3 15:06:18 UTC 2018

Hi Jakob,

On Tue, 2018-04-03 at 16:35 +0200, Jakob Dhondt wrote:
> recently I have migrated our dsc processes to a new host and changed
> some things along the way. One thing that I tried is filtering the
> traffic from a pcap-file according to TLD / SLD so that we can share
> part of the data where we act as secondary. I haven't found an easy way
> though. One thing I could imagine is to use bpf_filter but I couldn't
> find a way that does not involve knowing the exact byte values of the
> packages. So the only thing I have come up with for now is filtering the
> pcap beforehand, e.g. with tshark, and then feeding it to dsc. But I was
> wondering if there is a better solution.

Have you tried the QNAME filter?

  Defines a custom QNAME-based filter for DNS messages.  If
  you refer to this named filter on a dataset line, then only
  queries or replies for matching QNAMEs will be counted.

In your case I'd guess something like:

  qname_filter TLD-Only \.tld$ ;

Then add it to all datasets:

  dataset qtype dns All:null Qtype:qtype queries-only,TLD-Only;


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