[Pdns-users] PowerDNS Recursor / dnsdist: EDNS Client Subnet
b.candler at pobox.com
Sun Nov 24 11:07:09 UTC 2019
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 18.104.22.168/21
> (o2 Germany in Hamburg), usually the traffic to Akamai is routed to
> Akamai in Hamburg if I use o2's DNS, OpenDNS or 22.214.171.124. 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)
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