DNS Server
DSM Version
DNS Server
Features
- Resolution from domain names to IP addresses for devices or resources connected to the Internet or local area networks (LAN)
- Master, slave, and forwarding zones that ensure high availability of DNS service
- Flexible migration of DNS service through robust backup and restoring
Specifications
- Supported resource records: A, AAAA, CAA, CNAME, MX, NS, PTR, SPF, SRV, and TXT
- Manages DNS zones of the domain created by Synology Directory Server
- Listens on IP address changes of network interfaces to update DNS host records automatically (for AD zones only)
- Provides access control for zone transferring, DNS queries, and dynamic zone updates
- Safeguards the following mechanisms via TSIG (Transfer Signature) keys:
- Synchronization of DNS files
- Dynamic updates from master zones
- Sends recursive queries to resolve external DNS records
- Supports forwarders for resolving external DNS records
- Supports slave zone notifications
- Supports importing and exporting zone settings and resource records
- Supports split-horizon DNS, providing each client with customized DNS information
- Supports forward and reverse DNS lookups
- Supports searching and exporting logs
- Supports customizing the amount of system resources used by DNS activities:
- Maximum cache size
- Maximum cache TTL (Time-to-live)
- Maximum number of recursive clients
- Maximum number of TCP connections
- Maximum log size
Limitations
- Backup and restoring performed by Hyper Backup are only supported on DSM 5.1 or above
- For Synology Directory Server's zones, access control for slave zone notifications is integrated to that of zone transfer limitation
- Listening on IP address changes of network interfaces only triggers updates of the default domain name in Synology Directory Server's zones