D-Link DGS-3630-28SC Quick installation Guide - Page 112

NTP Access Group Settings, Management > NTP > NTP Access Group Settings

Page 112 highlights

DGS-3630 Series Layer 3 Stackable Managed Switch Web UI Reference Guide Parameter Prefer Description to 17. Select whether or not this entry will be the preferred peer for synchronization. Options to choose from are True and False. Click the Apply button to accept the changes made. Click the Edit button to re-configure the specific entry. Click the Delete button to delete the specified entry. Enter a page number and click the Go button to navigate to a specific page when multiple pages exist. NTP Access Group Settings This window is used to display and configure the NTP access group settings. 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. To view the following window, click Management > NTP > NTP Access Group Settings, as shown below: Figure 4-74 NTP Access Group Settings Window The fields that can be configured are described below: Parameter Default IP Address Netmask IPv6 Address IPv6 Mask Ignore No Serve No Trust Version No Peer Description Select this option to specify to use the default IPv4 (0.0.0.0/0.0.0.0) or IPv6 (::/::) address. The default IP address is always included with the lowest priority in the list. Select and enter the host IPv4 address here. Enter the IPv4 netmask of the host network here. Select and enter the host IPv6 address here. Enter the IPv6 prefix length of the host network here. Select this option to deny all packets, including NTP control queries. Select this option to deny all packets except NTP control queries. Select this option to deny packets that are not cryptographically authenticated. Select this option to deny packets that mismatch the current NTP version. Select this option to deny packets that might mobilize an association unless authenticated. The packets include broadcast, symmetric-active and many cast 100

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DGS-3630 Series Layer 3 Stackable Managed Switch Web UI Reference Guide
100
Parameter
Description
to 17.
Prefer
Select whether or not this entry will be the preferred peer for synchronization.
Options to choose from are
True
and
False
.
Click the
Apply
button to accept the changes made.
Click the
Edit
button to re-configure the specific entry.
Click the
Delete
button to delete the specified entry.
Enter a page number and click the
Go
button to navigate to a specific page when multiple pages exist.
NTP Access Group Settings
This window is used to display and configure the NTP access group settings. 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.
To view the following window, click
Management > NTP > NTP Access Group Settings
, as shown below:
Figure 4-74 NTP Access Group Settings Window
The fields that can be configured are described below:
Parameter
Description
Default
Select this option to specify to use the default IPv4 (0.0.0.0/0.0.0.0) or IPv6 (::/::)
address. The default IP address is always included with the lowest priority in the
list.
IP Address
Select and enter the host IPv4 address here.
Netmask
Enter the IPv4 netmask of the host network here.
IPv6 Address
Select and enter the host IPv6 address here.
IPv6 Mask
Enter the IPv6 prefix length of the host network here.
Ignore
Select this option to deny all packets, including NTP control queries.
No Serve
Select this option to deny all packets except NTP control queries.
No Trust
Select this option to deny packets that are not cryptographically authenticated.
Version
Select this option to deny packets that mismatch the current NTP version.
No Peer
Select this option to deny packets that might mobilize an association unless
authenticated. The packets include broadcast, symmetric-active and many cast