EndRun Sonoma D12, Руководство пользователя

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S o n o m a U s e r M a n u a l 20
C H A P T E R T H R E E
21 S o n o m a U s e r M a n u a l
N E T W O R K T I M E P R O T O C O L ( N T P )
Mask Alarm
In Stratum 1 operation an alarm will be indicated when there is a loss of signal. For Stratum 2 opera-
tion you may not want to see this alarm. You can mask it (prevent it from showing) by using the
console port (serial/network) command
setsigfltmask
. Or, on the front-panel keypad/display go
to the Faults submenu. Look for SigFltMask and set it appropriately.
Setting Up NTP Clients on
Unix-like Platforms
To configure your Unix-like computer to use your Sonoma Time Server, you must have success-
fully completed the NTP Server basic installation procedure described above. It is expected that you
are, or have access to, a capable Unix/Linux system administrator and know more than a little about
installing distributions from source code. Installation must be performed by a user with root privi-
ledges on the system.
If you have access to a usenet news server, many problems may be solved by the helpful people who
participate in the Internet news group devoted to NTP at comp.protocols.time.ntp .
Three methods of using the Sonoma with NTP clients on Unix-like platforms will be described:
Basic: This is the simplest, and will operate without MD5 authentication. NTP beginners should
always perform this setup first .
MD5: This method is trickier only because MD5 keys must be set up and distributed accurately to
the NTP clients in a secure way. The Sonoma is factory configured to authenticate its replies to NTP
MD5 clients using its default set of keys.
Broadcast/Multicast: This method simplifies configuration of the clients on large networks since
specific server addresses need not be configured in each client’s /etc/ntp.conf file. It can be config-
ured either with or without MD5 authentication. However, it is highly recommended that authentica-
tion be configured when using broadcast/multicast mode due to the relative ease with which a fake
NTP server can take over the clock setting of the broadcast/multicast clients on the network.
Unix-like Platforms: Basic NTP Client Setup
Basic setup is relatively simple, if:
• You have been able to successfully communicate with the Sonoma on your network.
• You have installed NTP on your client computer.
Configure NTP
You must edit the ntp.conf file which
ntpd
, the NTP daemon, looks for by default in the the /etc
directory. Add this line to the ntp.conf file:
server 192.168.1.120