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51-19
User Guide for Cisco Security Manager 4.4
OL-28826-01
Chapter 51 Configuring Server Access Settings on Firewall Devices
NTP Page
Field Reference
Add/Edit DDNS Update Methods Dialog Box
Use the Add/Edit DDNS Update Methods dialog box to define or edit a DDNS update method; currently
defined methods are listed in the DDNS Update Methods Dialog Box, page 51-18.
Navigation Path
You access the Add/Edit DDNS Update Methods dialog box by clicking the Add Row or the Edit Row
buttons in the DDNS Update Methods Dialog Box, page 51-18.
Related Topics
• Configuring DDNS, page 51-17
Field Reference
NTP Page
Network Time Protocol (NTP) is used to implement a hierarchical system of servers that provide
precisely synchronized timing for network systems. This kind of accuracy is required for time-sensitive
operations, such as validating Certificate Revocation Lists (CRLs), which include a precise time stamp.
You can configure multiple NTP servers. The security device chooses the server with the lowest
stratum—a measure of how reliable the data is.
Table 51-18 DDNS Update Methods Dialog Box
Element Description
Update Methods This table lists the currently defined update methods. Use the buttons
below the table to manage these entries.
Add Row button Opens the Add/Edit DDNS Update Methods Dialog Box, page 51-19
where you can define a new update method.
Edit Row button Opens the Add/Edit DDNS Update Methods Dialog Box, page 51-19,
where you can edit the method currently selected in the table.
Delete Row button Deletes the method currently selected in the Update Methods table;
confirmation may be required.
Table 51-19 Add/Edit DDNS Update Methods Dialog Box
Element Description
Method Name Provide an identifier for this method.
Update Interval Specify how often records are to be updated for this method: provide a
number of days, hours, minutes, and seconds. Note that while zero is
the default value for hours, minutes and seconds, there is no default Day
value: you must enter a number for Day.
Update Records Specify the resource record(s) to be updated: select Not Defined, A
Records, or Both A and PTR Records. Selecting A Records or Both
A and PTR Records overrides the setting in the Add/Edit DDNS
Interface Rule Dialog Box, page 51-18.