EndRun Meridian II, Руководство пользователя

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M e r i d i a n I I U s e r M a n u a l 74
C H A P T E R S E V E N
75 M e r i d i a n I I 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 )
Enter a key number (1-65534) or 0 to quit:
0
---NTP Authentication Configuration
Do you want authentication enabled using some or all of the keys in
the ntp.keys file? ([y]es, [n]o)
y
You will be prompted for the key numbers (1 - 65534), that you want NTP to
“trust”. The key numbers you enter must exist in your ntp.keys file. If you
do not want to use some of the keys in your ntp.keys file, do not enter them
here. NTP will treat those keys as “untrusted”.
Clients that use any of the “trusted” keys in their NTP polling packets will
receive authenticated replies from the Meridian II GPS. When you have entered
all of the “trusted keys” that you need, enter zero at the next prompt for a
key number.
Enter a trusted key number (1-65534) or 0 to quit:
1
Enter a trusted key number (1-65534) or 0 to quit:
2
Enter a trusted key number (1-65534) or 0 to quit:
0
---NTP Broadcast/Multicast Configuration
Would you like to enable broadcast/multicast server operation? ([y]es, [n]o)
y
Set the network broadcast/multicast address for the Meridian II GPS
to use. For broadcast mode on IPV4 networks, this address is
the all 1’s address on the sub-net.
Example: 111.112.113.255
On IPV6 networks, there is more than one way to
define a range of multicast addresses:
Example: ff05::1 (all nodes on the local site)
Example: ff02::1 (all nodes on the local link)
There are specific multicast addresses assigned for NTP Operation:
For IPV4 multicast operation, it is this specific address-> 224.0.1.1
For IPV6 multicast operation, it is this specific site scope address-> ff05::101
Enter IP address for NTP broadcast/multicast operation
(aaa.bbb.ccc.ddd or aaaa::bbbb ):
224.0.1.1
You have selected multicast operation. Enter the TTL value that is
needed for multicast packets on your network (1, 32, 64, 96, 128, 160, 192, 224):
32
It is highly recommended that authentication be used if you are using NTP
in broadcast/multicast mode. Otherwise clients may easily be “spoofed” by
a fake NTP server. You can specify an MD5 key number that the Meridian GPS
will use in its broadcast/multicast packets. The clients on your network must
be configured to use the same key.
Would you like to specify an MD5 key number to use with
broadcast/multicast mode? ([y]es, [n]o)
y
Enter the MD5 key number to use (1-65534):
2