Agree with Tony on TCP not going to be tried. Have you looked at using anycast? It is not true load balancing but it allows you to stand up multiple DNS servers that “shares” a single IP address.
On Wed, Feb 20, 2019 at 12:25 AM Tony Finch <d...@dotat.at> wrote: > 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. > _______________________________________________ > 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 >
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