0 ATTACKING THE DNS PROTOCOL

The DNS protocol consists of different types of DNS messages that are processed according to the information in their message fields. This section discusses the types of DNS messages and the fields in each message type.

In this section, the following DNS message topics are discussed:

• Message types
• DNS query message format
• DNS query message header
• DNS query question entries
• DNS resource records
• Name query message
• Name query response
• Reverse name query message
• DNS update message format
• DNS update message flags
• Dynamic update response message

Message types

There are three types of DNS messages:

• Queries
• Responses
• Updates

Queries and responses are defined in the original DNS standard, and updates are defined in RFC 2136. All three types follow a common message format.


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