For DNS in particular, if you like trying to run things yourself (e.g. to learn), you can use PowerDNS with Lua records: https://doc.powerdns.com/authoritative/lua-records/. You can use the ifportup f

If I have 2 servers that are almost identical and I need the second server to be used in the event that the second goes down I believe that is called fail over DNS.

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And in any case I have to change DNS and rDNS?

* rDNS update

Not sure why it's even asking for this on the first step in the process, as there's approximately 0 chance I'd move my DNS from where it's been for the last 15 years to some random VPS.

personal sites, blogs or other webservices. 3 DNS servers. One VPS is nothing but a VPN hub, handling all the routing for the internal IPv6 net that every VPS is connected to via a wireguard network.

73.20 Mbit/s 70.694 ms Germany, Berlin (DNS:NET) 110.62 Mbit/s 437.11 Mbit/s 74.911 ms Germany, Munich (InterNetX) 109.21 Mbit/s 388.08 Mbit/s 71.019 ms Denmark, Copen

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* adguard home dns (f.ck ads)

As Francisco said, commonly abused domain for DNS amplification due to its large RRSIG response size (>10k bytes)

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It's a very common DNS amplification domain that gets abused.

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@InceptionHosting could you give a little more details as to what is complimentary ddos protection? Interested in getting 2 of these from you to serve dns.

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You don't get port 80 unless you use something like Cloudflare DNS to redirect inquires to your IPv6 port 80.

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It resolves to 0.0.0.0....ah, I think my DNS resolver has decided it's something unpleasant.

but a GeoDNS should handle it on DNS level, so ports dont matter