Note: Before you can edit the Key field, you must set up
Symmetric Keys through the Actions Panel. See "NTP:
Symmetric Keys (MD5) " on page131. Conversely, you
may check the Autokey box below the Key field.
Enable Autokey: Click the check box to enable/disable Autokey. See
"NTP Autokey" below for more information on Autokey.
Note: When you configure NTP Autokey, you must first
disable the NTP service in the NTP Services panel, then
re-enable it after Autokey configuration is completed.
Mark as Preferred: Check this box to prefer this NTP Peer over other
NTP Peers ("NTP Peer Preference"). This will result in VersaSync syn-
chronizing more frequently with this Peer. For additional information
on NTP Preferences, see "Configuring "NTP Stratum 1" Operation" on
page116.
Note: Please note that it is not advisable to mark more
than one NTP Peer as Preferred, even though VersaSync
will not prevent you from doing so.
5. Click Submit, or press Enter.
2.8.11.9 NTP Authentication
Since NTP information is distributed across entire networks, NTP poses a security
risk:Falsified NTP time stamps or other NTP-related information can be exploited
by an attacker. NTP authentication keys are used to authenticate time syn-
chronization, thus detecting a fake time source before it can do harm.
NTP Autokey
The NTP version installed on VersaSync supports the Autokey Protocol. The
Autokey Protocol uses the OpenSSL library which provides security capabilities
including message digests, digital signatures and encryption schemes. The
Autokey Protocol provides a means for NTP to authenticate and establish a chain
of trusted NTP servers.
NTP Autokey: Support & Limitations
2.8 Configuring Network Settings
CHAPTER 2 • VersaSync User Manual Rev. 12
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