On 24/11/2019 10:50, Bjoern Franke via Pdns-users wrote:
E.g. if I use DoT with my mobile phone and come from 89.15.232.0/21
(o2 Germany in Hamburg), usually the traffic to Akamai is routed to
Akamai in Hamburg if I use o2's DNS, OpenDNS or 8.8.8.8. Using my
dnsdist in Nuremberg, Akamai traffic is routed to Frankfurt.
I enabled "useClientSubnet=true" for dnsdist and several EDNS Client
options in PowerDNS Recursor (ecs-add-for, edns-subnet-whitelist,
use-incoming-edns-subnet) but nothing changes.
Have you tried running tcpdump on the traffic:
- between dnsdist and recursor;
- between recursor and authoritative nameservers?
Can you see the client-subnet option in the packets? At least it will
tell you which of the two servers is not adding (or forwarding)
client-subnet.
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