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Knowledge Center

Settings

This page displays information and settings related to the number of system resources used by DNS activity.

Status

This section displays the following information:

  • Number of recursive queries: The current number of recursive queries handled by your Synology NAS. The maximum number of recursive queries can be modified below.
  • TCP connections: The current number of TCP connections used for DNS queries.

Settings

You can customize the number of system resources used by DNS activity according to your environment.

To edit settings:

You can modify the following numbers in the Settings section:

  • Maximum cache size: Choose how much cache can be used by DNS activity. The maximum cache size can be set from 0 to 4095 (MB). Normally, each resource record is saved to the cache until its TTL (Time-to-live) expires. When the cache size reaches the limit, however, the least recently used resource records will be deleted from the cache. If the maximum cache size is set to 0, each resource record remains in cache until its TTL expires.

    Note:

    • The maximum cache size set below 2 MB will be referred to as 2 MB.
    • When there are multiple views in DNS Server, the cache limit of each view equals the maximum cache size.
  • Maximum cache TTL (Time-to-live): Each resource record is deleted from the cache when its TTL expires. The maximum cache TTL can be set from 1 to 4,294,967,295 (seconds).
  • Maximum number of recursive clients: Choose how many clients can make recursive requests through Synology NAS. The maximum number of recursive clients can be set from 1 to 2,147,483,647.
  • Maximum number of TCP connections: Zone transfers and some queries adopt TCP connections. The maximum number of TCP connections can be set from 1 to 2,147,483,647.
  • Maximum log size: Choose maximum size for log files. The maximum log size can be set from 1 to 2,147,483,647.

After modifying the settings, click Apply.