DNS Server
DNS Resolution and Forwarding
- Resolves domain names to IP addresses for Internet and local network resources.
- Provides primary, secondary, and forwarding zones to ensure DNS service availability.
- Sends recursive queries to resolve external DNS records.
- 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).
- Allows importing and exporting zone settings and resource records.
- Supports forward and reverse DNS lookups.
- Supports split-horizon DNS, providing each client with customized DNS information.
- Supports forwarders for resolving external DNS records.
- Supported resource records: A, AAAA, CAA, CNAME, MX, NS, PTR, SPF, SRV, and TXT.
Management and Security
- Provides access control for zone transferring, DNS queries, and dynamic zone updates.
- Provides TSIG keys to secure:
- DNS file synchronization
- Dynamic updates from primary zones.
- Supports secondary zone notifications.
- Allows 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
- For Synology Directory Server's zones, access control for secondary zone notifications is integrated to that of zone transfer limitations.
- Listening on IP address changes of network interfaces only triggers updates of the default domain name in Synology Directory Server's zones.