Configuring Dns Relay Information - D-Link DGS-3324SR User Manual

D-Link DGS-3324SR Layer 3 Stackable Gigabit Ethernet Switch
Mapping Domain Names to Addresses
Name-to-address translation is performed by a program called a Name server. The client program is called a
Name resolver. A Name resolver may need to contact several Name servers to translate a name to an address.
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 subdomain. 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.

Configuring DNS Relay Information

To configure the DNS relay function on the Switch, open the Configuration folder to Layer 3 IP Networking,
and click the DNS Relay folder. In this folder, click the DNS Relay Information link to open the following
window.
The following fields can be set:
Parameter
DNS Relay Status
<Disabled>
Primary Name
Server <0.0.0.0>
Secondary Name
Server <0.0.0.0>
Figure 4- 82. DNS Relay Information window
Description
This field can be toggled between Disabled and Enabled using the pull-
down menu, and is used to enable or disable the DNS Relay service on the
switch.
Allows the entry of the IP address of a primary domain name server (DNS).
Allows the entry of the IP address of a secondary domain name server
(DNS).
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