Chapter 15. DNS Messages and Records

This chapter describes the binary messages and Resource Record (RR) formats that pass between DNS servers. These messages comprise what is sometimes called the wire format because it is the format sent across the network, or wire, in the understated slang of the network professional. While it is primarily a reference section with copious descriptions of bits and bytes, this chapter is also intended to allow the naturally curious reader to understand just what is a referral, or when a dig command is issued just what are the ANSWER SECTION and AUTHORITY SECTION that are returned, as well as why are there only 13 root-servers (because of packet size considerations). The chapter is laid out in two sections. The ...

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