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Synology NAS User's Guide
Based on DSM 4.3
95 Chapter 19: Create a Domain Name Server with DNS Server
Check firewall or port forwarding settings: DNS services require the use of TCP and UDP port 53. If your
Synology NAS uses a firewall, this port must be opened. If the Synology NAS connects to the Internet through
a router, set up port forwarding rules and open TCP and UDP port 53.
Register your device: After you set up DNS Server, remember to register the IP address and other required
information of your Synology NAS with the provider of your domain name. Otherwise, clients will be unable to
query your Synology NAS over the Internet. Consult your domain name provider for more information.
DNS Server Features
Once properly installed and setup, DNS Server provides the below features. For more detailed instructions
regarding these and other features, please see DSM Help.
Zones
This page provides options to manage your domain names by creating and modifying zones. A zone refers to a
portion of the domain name space for which a domain name server is authoritative and possesses complete
information. With DNS Server, zone files can be created, stored, and managed on the Synology NAS.
Zones are divided into three types: Master zones, Slave zones and Forwarding zones. Master zones possess
information for zone files. Slave zones copy zone files from master zones (an operation called zone transfer).
Forwarding zones forward DNS queries to specific forwarders.
Resolution
You can enable resolution services to allow the Synology NAS to resolve recursive queries. A recursive query
occurs when the Synology NAS is not authoritative for a requested domain. In this case, the Synology NAS
queries other domain name servers until the information is found, or until the query fails.
For example, if a client queries your Synology NAS for the address of "synology.com," but your Synology NAS is
not authoritative for this domain (i.e. you do not own synology.com), it will query other domain name servers or
forward the request to specified forwarder servers, and then relay the result back to the sender of the query.
Keys
TSIG (Transfer Signature) keys limit what hosts are allowed to synchronize zone files from the master server.
This page displays the keys currently used by DNS Server.
Views
A domain name server can present different information to different clients by implementing views. This function,
sometimes called spilt-horizon DNS, can improve security and privacy management of DNS zone records. For
example, you have one domain name, but wish to provide different responses to queries from external and
internal sources. In such cases, you can create different views with separate resource records.
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