Hi, small question, to check what we may be missing. We have a big traffic increment from dnsdist to clients and backend-servers (5 times to clients, an 20 times from backends).
The reason we found is a lot of TXT queries for c9-11.com which results in almost 4k size answer. Besides this being something abnormal, the question is why dnsdist is not caching this answers. Our cachehit dropped from usual 98% to 84%, and we can see that the queries are forwarded to the backends, (unbound and pdns) which answer from theirs cache. The ttl is large. And the backend queries went from 1kqps to almost 5kqps. So, the traffic form customers to dnsdist is understandable, but not the traffic from dnsdist to backend servers. If it helps, at the same time the metrics for "cache deferred lookups per poool" and "cache deferred inserts per pool" incremented proportionally. Thanks!!
_______________________________________________ dnsdist mailing list email@example.com https://mailman.powerdns.com/mailman/listinfo/dnsdist