Randy Bush <ra...@psg.com> wrote: > > estimate or measure the distribution of the ratio of udp to tcp queries > on say 100 cctld servers.
On a recently rebooted auth server, which hosts zones for a handful of universities with and without DNSSEC, slightly less than 1% of queries are over TCP. $ curl -Ssf http://authdns1.csx.cam.ac.uk:8053/json/v1 | jq '[ .nsstats.QryUDP, .nsstats.QryTCP ]' [ 6994195, 61575 ] I have a few config options which can affect TCP usage. These two should reduce it: minimal-responses yes; minimal-any yes; These ones can increase it: rate-limit { responses-per-second 10; ipv4-prefix-length 32; exempt-clients { cudn; }; }; max-udp-size 1420; (The latter is to avoid UDP fragmentation.) This is not a very beefy server so I haven't increased the TCP concurrency very much: tcp-clients 256; Tony. -- f.anthony.n.finch <d...@dotat.at> http://dotat.at/ Fisher, German Bight: South, veering west 3 or 4, occasionally 5 later. Smooth or slight. Showers. Moderate or good. _______________________________________________ Please visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe from this list bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users
