D-Link DGS-1510 Series Reference Manual page 438

DGS-1510 Series Gigabit Ethernet SmartPro Switch CLI Reference Guide
The NTP implements a general purpose Access Control List (ACL) containing address/match entries
sorted first by increasing address values and then by increasing mask values. A match occurs when
the bitwise AND of the mask and the packet source address is equal to the bitwise AND of the mask
and address in the list. The list is searched in order with the last match found defining the restriction
flags associated with the entry.
Example
This example shows how to deny new associations by default except for 192.43.244.18,
128.175.0.0/16 and 128.4.1.0/24 (need authentication).
Switch#configure terminal
Switch(config)#ntp access-group default nopeer
Switch(config)#ntp access-group 128.175.0.0 mask 255.255.0.0
Switch(config)#ntp access-group 128.4.1.0 mask 255.255.255.0 notrust
Switch(config)#ntp access-group 192.43.244.18
Switch(config)#
51-2 ntp authenticate
This command is used to enable NTP authentication. Use the no form of this command to disable
NTP authentication.
ntp authenticate
no ntp authenticate
Parameters
None.
Default
By default, this option is enabled.
Command Mode
Global Configuration Mode.
Command Default Level
Level: 12.
Usage Guideline
When this feature is enabled, networking nodes will not synchronize with the Switch unless it carries
one of the authentication keys specified in the ntp trusted-key command.
Example
This example shows how to enable NTP authentication.
Switch# configure terminal
Switch(config)#ntp authenticate
Switch(config)#
51-3 ntp authentication-key
This command is used to define an authentication key for NTP. Use the no form of this command to
remove the key.
ntp authentication-key KEY-ID md5 VALUE
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