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8.3.3.7 Configuring the NTP Access Restrictions
One of the extended configuration options for NTP is the "Access Restrictions" (NTP access
restrictions).
Restrictions are used in order to control access to the System’s NTP service and these are
regrettably the most misunderstood options of the NTP configuration.
If you are not familiar with these options, a detailed explanation can be found at
IP addresses should be used when configuring the restrictions
– no Host-
names!
The following steps show how restrictions can be configured - should these not be required it
is sufficient to retain the standard settings.
The standard restrictions tell the NTP service how to handle packets of hosts (including remote
time servers) and sub-network which otherwise have no special restrictions.
The NTP configuration can simplify the selection of the correct standard restrictions while mak-
ing the required security available.
Before beginning the configuration the points
user:
8.3.3.7.1 NAT or Firewall
Are incoming connections to the NTP Service blocked by NAT or a Stateful Inspec-
tion Firewall?
No
Proceed to
Chapter 8.3.3.7.2 Blocking Unauthorised Access
Yes
No restrictions are required in this case.
Proceed further to
Chapter 8.3.3.7.4 Internal Client Protection / Local Network
