Dear Tony, thanks for your response. I've read something I don't know if it's true or not:
DNC clients send a UDP query to a DNS server, if no response is received until some seconds, then they try with UDP. You tell me this is not true, just clients try with UDP is the response is truncated. Can you confirm thgis is true in 100% of clients??? Thanks again, regards !! El mar., 19 feb. 2019 a las 13:24, Tony Finch (<d...@dotat.at>) escribió: > Roberto Carna <robertocarn...@gmail.com> wrote: > > > Dear, I have to balance two DNS servers for a special reason. > > https://www.powerdns.com/dnsdist.html > > > The DNS clients are a mix of Windows, Cisco and Linux machines, so I > > think they ask for a FQDN using UDP and after that -if there is no > > response-, they ask the same FQDN using TCP, and so the load balancing > > will be succesful. > > No, fallback to TCP relies on receiving a truncated UDP response. You > never want a DNS client to be waiting around for a response that will > not arrive. > > Tony. > -- > f.anthony.n.finch <d...@dotat.at> http://dotat.at/ > Rockall, Malin: Southeast veering southwest 6 to gale 8, occasionally 5 > later. > Rough or very rough. Rain. Moderate or poor. >
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