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NTP Access Restrictions

Next to encrypted authentication by means of Symmetric Keys, NTP supports a list-based means of access restriction, the use of which is also recommended to prevent fraudulent or inadvertent manipulation of a time server.

To configure NTP Access Restrictions:

  1. Navigate to MANAGEMENT > NETWORK: NTP Setup.
  2. In the Actions panel, click Access Restrictions:

  3. The NTP Access Restrictions Status window will display:

    • To ADD or EDIT an access restriction, click the PLUS icon or the Change button, respectively, and proceed to Step 4. below.
    • To DELETE an access restriction, click the corresponding Delete button, and confirm by clicking OK.
  4. The NTP Access Restrictions window will display:

    • Fill in the fields:
      • Restriction Type—Choose either Allow or Deny.

        If you select “Deny”, the configured portion of the network will not have NTP access to NetClock, but the rest of the network will have access to NetClock. If you select “allow”, the configured portion of the network will have NTP access to NetClock, but the rest of the network will not have access to NetClock. By default, NetClock allows all IPv4 and IPv6 connections.

      • IP Version—Choose IPv4 or IPv6
      • IP Address—Enter the appropriate hostname.
      • Subnet Mask—Enter the appropriate IP mask.
      • Require Authentication (checkbox)—Check this box if you want the additional security of authorized access. NetClock to accept only authenticated requests (MD5 or Autokey) from this user or network segment.
      • Allow NTP Queries (checkbox)—Check this box if you want to allow external NTP queries into NetClock services.
  5. Click the Submit button.