User guide

Configuration Procedures
Chapter 13 Configuring DNS 65
Types of Name Servers
There are two types of name servers in the domain name system:
• Local servers maintain information for resources within a local zone. It is up to individual network adminis-
trators to determine the scope of a local zone.
• Root servers maintain information in higher-level domains than do local servers.
Typically, when a user requires information about a domain name, the resolver queries a local server. If local
servers cannot provide the information, root servers are queried next.
Naming Conventions
Each node in the domain name system has a globally unique domain name that consists of its own name, which
is called a label, and the labels of all superior nodes.
DNS Name Example
Here is an example of a domain name. Note that labels are separated by periods:
mn07.amalgamated.com
In this example, mn07 is part of the higher-level domain called amalgamated.com.
Configuration Procedures
Procedure for Using a Name Server
To configure a DNS server, enter the following command:
set config domain=domain myname=name dns=ip-address
where
• domain is the domain in which the Digi One and PortServer TS 2/4 will reside
• name is a DNS name for Digi One and PortServer TS 2/4
• ip-address is the IP address of a name server
Example: set config domain=digi.com myname=poe dns=204.221.1.4
Procedure for Using a Host File
Use this section to configure the host table, which maps IP addresses to host names.
Enter the following command
set host name=name ip=ip-address
where
• name is the name the host
• ip-address is the IP address of the host
Example
In this example, three IP address-to-name mappings are configured
set host name=poe ip=204.221.110.200
set host name=gary ip=204.221.110.202
set host name=toni ip=204.221.110.203