3. Time Synchronization
ROX™ v2.2 User Guide
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RuggedBackbone™ RX5000
Prefer
Marks this server as preferred.
Key
Synopsis: unsigned short integer
An authentication key associated with this host.
3.2.5. Adding Server Keys
Use server keys to use authentication for NTP communications. NTP authentication authenticates the
time source to help prevent tampering with NTP timestamps. When using authentication, both the local
and remote servers must share the same key and key identifier. Packets sent to and received from the
server/peer include authentication fields encrypted using the key.
Keys defined here are associated with NTP servers on the Network Time Protocol (NTP) Servers and
NTP Broadcast/Multicast Servers forms.
To add a server key:
• In edit mode, navigate to /services/time/ntp/key and click <Add key>.
• On the Key settings form, enter an identifier for the key and click Add.
• On the Server Keys form, set the key parameters.
• Commit the changes.
Figure 3.6. Server Keys form
Key
Synopsis: "AES CFB128"-encrypted string
Key.
Trusted
Mark this key is trusted for the purposes of authenticating peers with symmetric key cryptography.
The authentication procedures require that both the local and remote servers share the same key
and key identifier.
3.2.6. Configuring NTP Server Restrictions
Use server restrictions to control and restrict access to the NTP server.
To set NTP server restrictions:
• In edit mode, navigate to /services/time/ntp/restrict and click <Add restrict>.
• On the Key settings form, set the following parameters and click Add.