Dhcp Local Relay Settings; Dns; Dns Relay - D-Link DES-3528 - xStack Switch - Stackable Reference Manual

xStack® DES-3528/DES-3552 Series Layer 2 Stackable Fast Ethernet Managed Switch Web UI Reference Guide
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DHCP Local Relay Settings

The DHCP local relay settings allows the user to add option 82 into DHCP request packets when the DHCP client gets
an IP address from the same VLAN. If the DHCP local relay settings are not configured, the Switch will flood the
packets to the VLAN. In order to add option 82 into the DHCP request packets, the DHCP local relay settings and the
state of the Global VLAN need to be enabled.
To view this window, click Network Application > DHCP > DHCP Local Relay Settings, as shown below:
The fields that can be configured are described below:
Parameter
DHCP Local Relay
Global State
VLAN Name
State
Click the Apply button to accept the changes made for each individual section.

DNS

DNS Relay

Computer users usually prefer to use text names for computers for which they may want to open a connection.
Computers themselves, require 32 bit IP addresses. Somewhere, a database of network devices' text names and their
corresponding IP addresses must be maintained.
The Domain Name System (DNS) is used to map names to IP addresses throughout the Internet and has been
adapted for use within intranets.
For two DNS servers to communicate across different subnets, the DNS Relay of the Switch must be used. The DNS
servers are identified by IP addresses.
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.
Figure 9-19 DHCP Local Relay Settings window
Description
Enable or disable the DHCP Local Relay Global State. The default is Disabled.
This is the VLAN Name that identifies the VLAN the user wishes to apply the DHCP Local
Relay operation.
Enable or disable the configure DHCP Local Relay for VLAN state.
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