NTP Tab
Minimum / Maximum Poll Interval:
These options specify the minimum and maximum poll inter-
vals for NTP messages, in seconds to the power of two. The maximum poll interval defaults
to 10 (1,024 s), but can be increased to an upper limit of 17 (36.4 h). The minimum poll inter-
val defaults to 6 (64 s), but can be decreased to a lower limit of 4 (16 s).
MD5 Key
: Use this field to authenticate NTP messages to and from the SyncServer for this
specific association. When enabled, the NTP packet header includes authentication fields
encrypted using either the MD5 key number (1 to 16).
Time to Live:
This option is used only with broadcast association. It specifies the time-to-live
on broadcast server. Consult with the network administrator to specify a correct value. If this
field is left blank, the value of TTL defaults to 127.
RESTART button
After changing the NTP configuration, click the
RESTART
button to put the new configuration
into effect. While the NTP daemon restarts, its services are temporarily unavailable, and it
generates the following alarm events: NTP Stratum Change, NTP System Peer Change,
NTP Leap Change.
NTP- MD5Keys
Use this page to generate or manipulate keys generated using the RSA Message Digest 5
(MD5) algorithm authentication method. MD5 Keys are used to authenticate (not encrypt)
NTP messages sent or received by the SyncServer, using a cryptochecksum.
Also see Using MD5 Keys on a SyncServer.
NTP MD5 Security Keys
Use this page to manage MD5 keys as follows:
n
View and copy the current keys.
n
Upload a file containing keys from a local PC drive to the SyncServer.
n
Download the SyncServer's current key file to a local PC drive.
Generate:
This button generates new random MD5 keys, immediately replacing any previous
MD5 keys.
Current Keys:
This window displays the current list of keys.
The first line gives the SyncServer's hostname and the NTP time stamp of when the keys
were created. The second line shows the local time and date the keys were generated.
Each row of key information provides the following information:
n
The key number, 1 through 16
n
The key type, "MD5".
n
The key, an ASCII string containing only displayable characters. As an example, the ran-
dom key generator may produce "\jdh.u$r;x"y:upH"
n
A comment that identifies the key type. For example: "# MD5 key"
997-01520-02 Rev. G2
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