Dns Relay; Dns Relay Global Settings - D-Link xStack DGS-3400 Series Reference Manual

x Stack
TX Source Ports
Click Apply to implement the changes.

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.
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 Global Settings

To view this window, click Administration > DNS Relay > DNS Relay Global Settings, as shown below.
®
DGS-3400 Series Layer 2 Gigabit Ethernet M anaged Sw itch
for that RSPAN session.
The goal of TX source ports is to monitor as much as possible all the packets sent by
the source interface after all modification and processing is performed by the switch.
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