DNS/課題/qname-minimization

DNS/課題/qname-minimizationについて、ここに記述してください。

1. qname-minimization

   QNAME minimisation is legal, since the original DNS RFC do not
   mandate sending the full QNAME.

2. NS query

broken middleboxes

Some broken name servers do not react properly to qtype=NS requests.
   For instance, some authoritative name servers embedded in load
   balancers reply properly to A queries but send REFUSED to NS queries.
   This behaviour is a protocol violation, and there is no need to stop
   improving the DNS because of such behaviour.

Knot resolverがおもしろい。（実装、試行中のようだ。）

•  Will this algorithm will be harder to deploy 
because of middleboxes that might trap NS queries as unexpected, or broken authority
servers that don’t respond correctly to explicit NS queries?

NSを持たない中間ノード(emptyではないものもある）をどうキャッシュして、利用するか。