User guide

In This Chapter
Chapter 13 Configuring DNS 64
Chapter 13 Configuring DNS
In This Chapter
This chapter discusses how to configure Digi One and PortServer TS 2/4 to use DNS. Topics discussed include
the following:
About the Domain Name System ..................................................................................................64
Configuration Procedures ..............................................................................................................65
About the Domain Name System
This section discusses key concepts of the domain name system.
Purpose of DNS
The domain name system maps domain names to information associated with these names, such as IP addresses.
DNS Components
DNS components include:
• A distributed database consisting of domain names and associated information
• A hierarchical system of domain name servers that maintain the database and use it to respond to requests for
information about a particular domain name, such as its IP address
• Domain name resolvers that
— Accept requests from users
— Satisfy information requests by building and submitting properly formulated queries to one or more name
servers or by retrieving information from a local host file
— Return information to users
— Cache information for future use