Dns Relay - D-Link xStack DGS-3420 Series Reference Manual

xStack® DGS-3420 Series Layer 2 Managed Stackable Gigabit Switch Web UI Reference Guide
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 Relay

DNS Relay Global Settings
This window is used to configure the DNS Relay global parameters.
To view this window, click Network Application > DNS > DNS Relay > DNS Relay Global Settings as shown
below:
The fields that can be configured are described below:
Parameter
DNS Relay State
Primary Name Server
Secondary Name Server
DNS Relay Cache State
DNS Relay Static Table
State
Click the Apply button to accept the changes made.
Figure 9-28 DNS Relay Global Settings Window
Description
Use the drop-down menu to enable or disable the DNS relay state.
Enter the primary DNS server IP address.
Enter the secondary DNS server IP address.
Use the drop-down menu to enable or disable the DNS relay cache state.
Use the drop-down menu to enable or disable the DNS relay static table state.
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