DNS/tdnsについて、ここに記述してください。
<<TableOfContents()>>

== link ==
https://labs.ripe.net/Members/bert_hubert/introducing-tdns-the-teachable-authoritative-dns-server


Introducing 'tdns': the Teachable Authoritative DNS Server
bert hubert — 20 Apr 2018 

https://github.com/ahupowerdns/hello-dns/tree/master/tdns

{{{
A warm welcome to DNS
}}}
https://powerdns.org/hello-dns/

== basic ==
https://powerdns.org/hello-dns/basic.md.html

The concept of a DNS name is non-trivial and frequently misunderstood. 

   ドメイン名空間を理解しなければ、DNSの話はできない。-- ToshinoriMaeno <<DateTime(2020-08-18T10:48:07+0900)>>

日本なら、JP TLD下のゾーン木を図にしてみるのがよいだろう。
  https://jprs.jp/glossary/imgs/zone.png 

== www.ietf.org AAAA RR はどこに ==
階層との関係

{{{
'www.ietf.org' can be defined in four different places.

It could be in the 'root' zone itself, fully written out:

www.ietf.org	IN	AAAA	3600	2400:cb00:2048:1::6814:55

Or it could be in the org zone, where it might look like this:

$origin ORG
www.ietf	IN	AAAA	3600	2400:cb00:2048:1::6814:55

Or, (as is actually the case), this name could live in the 'ietf.org' zone:

$origin ietf.org
www	IN	AAAA	3600	2400:cb00:2048:1::6814:55

And finally, it is even possible that there is a zone called 'www.ietf.org',
where the record lives like this:

$origin www.ietf.org
@	IN	AAAA	3600	2400:cb00:2048:1::6814:55

}}}

== 権威サーバーの動作 ==
あるいはzone cutsについて。

When an authoritative server receives a query for 'www.ietf.org',
it consults which zones it knows about and answers from the most specific zone it has available. 

この説明は現状の一部を記述しているに過ぎない。

== zone ==
----
https://github.com/ahupowerdns/hello-dns/blob/master/tdns/tauth.md