If you go with Anycast via BGP, make sure your network infrastructure has "multipath" enabled, otherwise the traffic will be skewed to one node or the other. https://tools.ietf.org/id/draft-lapukhov-bgp-ecmp-considerations-01.html is one source which summarizes some of the literature and standards on the subject.
- Kevin On Tue, Feb 19, 2019 at 2:01 PM Josh Kuo <josh....@gmail.com> wrote: > 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 >> > _______________________________________________ > 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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