2.15.10 Ntp Access Restrictions - Safran SecureSync 2400 User Manual

2.15 Configure NTP
NOTES:
Duplicate key IDs are not permitted. NTP requests received by that do not con-
tain an authenticator containing a valid Key ID and MD5 message digest pair will
be responded to, but no authentication will be performed. An NTP request with
valid authenticators results in a valid NTP response with its own valid authen-
ticator using the same Key ID provided in the NTP request.
You may define the trusted Symmetric Keys that must be entered on both
SecureSync, and any network client with which SecureSync is to communicate.
Only those keys for which the "Trusted" box has been checked will appear in the
dropdown menus on the NTP References screen.

2.15.10 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:
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