DNS traffic accounting

Matthew Seaman m.seaman at infracaninophile.co.uk
Tue Jul 18 15:37:27 UTC 2017

On 07/18/17 16:09, Abi Askushi wrote:
> I am trying to figure out how could I account the DNS traffic generated
> from clients in terms of bytes. My setup is a simple caching DNS with
> several clients querying the DNS server.  I can measure the DNS traffic
> that is generated from the DNS server on the WAN side by using some
> monitoring tool (pmacct) but I am not sure how could I account this traffic
> to the clients that are generating this traffic. By simply monitoring the
> internal DNS traffic from clients I expect to not be accurate since it will
> include also cached responses which do not generate WAN traffic.
> Any suggestion how to approach this problem?

The implication of what you're suggesting is that if client A looks up
some address that isn't in the cache, then they will be charged for
that. However, if client B then comes along and looks up the exact same
address shortly afterwards, they'll get a response from cache and so not
be charged.  That seems a bit arbitrary.

Why not charge your clients based simply on the number of queries they
make against your resolver?  You know or can easily find out how many
queries your resolver is handling in total and how much the WAN traffic
that generates is costing you so it should be fairly easy to come up
with a charging scheme based on the average cost per DNS query.



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