DNS/Deadwood/検索動作について、ここに記述してください。

引用元:　http://maradns.samiam.org/deadwood/doc/Recursive-algorithm.html

/2 How Deadwood stops blind spoofing attacks

/3 Handling "incomplete" answersHandling "incomplete" answers

/4 Linking names to IPs

1. How Deadwood resolves a name

A simplified version of the method Deadwood uses to resolve a domain via recursion is as follows:

  1. Deadwood gets a request to resolve a given domain from a stub resolver
  2. Deadwood requests a domain from a root server.
  3. Deadwood gets an answer from that server.
  4. Deadwood looks at the answer.
  5. There are three types of answers Deadwood can get:
    1. A complete answer that answers the DNS question.
    2. An incomplete NS referral, which can either have glue or be glueless.
    3. An incomplete CNAME referral
  6. If the answer is a complete answer, Deadwood sends the answer back to the stub resolver.
  7. If the answer is an incomplete answer, Deadwood must send more queries to get a complete answer.
    • I will detail this process below.

/3 Handling "incomplete" answersHandling "incomplete" answers

検索はつねに root server から始めるようだ。