Dns Global Settings - D-Link DGS-1510 Series Web Ui Reference Manual

DGS-1510 Series Gigabit Ethernet SmartPro Switch Web UI Reference Guide
The Domain Name System (DNS) servers are organized in a somewhat hierarchical fashion. A single
server often holds names for a single network, which is connected to a root DNS server - usually
maintained by an ISP.
Domain Name Resolution
The domain name system can be used by contacting the name servers one at a time, or by asking the
domain name system to do the complete name translation. The client makes a query containing the name,
the type of answer required, and a code specifying whether the domain name system should do the entire
name translation, or simply return the address of the next DNS server if the server receiving the query
cannot resolve the name.
When a DNS server receives a query, it checks to see if the name is in its sub domain. If it is, the server
translates the name and appends the answer to the query, and sends it back to the client. If the DNS
server cannot translate the name, it determines what type of name resolution the client requested. A
complete translation is called recursive resolution and requires the server to contact other DNS servers
until the name is resolved. Iterative resolution specifies that if the DNS server cannot supply an answer, it
returns the address of the next DNS server the client should contact.
Each client must be able to contact at least one DNS server, and each DNS server must be able to
contact at least one root server.
The address of the machine that supplies domain name service is often supplied by a DHCP or BOOTP
server, or can be entered manually and configured into the operating system at startup.

DNS Global Settings

This window is used to configure the DNS global settings.
To view the following window, click Management > DNS > DNS Global Settings, as shown below:
The fields that can be configured are described below:
Parameter
IP Domain Lookup
IP Name Server Timeout
Click the Apply button to accept the changes made.
Figure 4-38 DNS Global Settings window
Description
Select this option to enable or disable the DNS to carry out the domain
name resolution.
Enter the maximum time to wait for a response from a specified name
server. This value is between 1 and 60 seconds.
59