NetFlow Settings

Use this dialog to configure general settings for NetFlow Monitor.

Enter or select the appropriate information in the following fields.

General

Listener port. Enter the TCP/IP port number over which the NetFlow Monitor Collector service should listen for NetFlow information.

Note: If you change the listener port from the default, you may have to add an exception to the firewall if you are using the Windows Firewall.

Log level. Select the level of details you want to write to the log.
- Normal. Select this option to record errors and some general event information.
- Verbose Logging. Select this option to record more detailed information than normal logging. This option can create a very large file and may be resource intensive, however, it is especially helpful for troubleshooting issues.
- Errors Only. Select this option to record only events that register as errors.
Enable informational tooltips. Select this option to enable NetFlow Monitor to display tooltips with information about possible problems and other information about report details.

Report Data

Data collection interval. Select how often NetFlow Monitor writes collected data from its sources to the database. You may select 1, 2, 3, 4, 5, or 10 minutes. By default, data is written to the database every 2 minutes.
Note: Modifying collection interval settings affects both the granularity you see in NetFlow Monitor reports. If the interval is set to 5 minutes, you cannot distinguish traffic collected during the first minute from traffic collected during the fourth minute.
Roll up raw data after. Enter the number of days and/or hours after which raw data collected from your NetFlow devices should be rolled up. This setting determines the number of hours of raw data that can be reported on at any given time. After data has been rolled up, NetFlow Monitor can report data usage for each hour, but detailed granular data (such as bytes, flows, and percentages) is aggregated into a single value for the entire hour. By default, raw data is rolled up after 8 hours.
Caution: Modifying the roll-up settings directly affects the size of the NetFlow Monitor databases and the performance of the application. We recommend that you modify these settings cautiously, monitoring the effects on database size and application performance.
Roll up hourly data. Enter the number of days after which hourly data should be rolled up into daily data. After hourly data is rolled up, NetFlow Monitor can only report aggregated totals for entire 24-hour blocks of time. By default, hourly data is rolled up after 3 days.
Archive daily data. Enter the number of days after which daily data should be moved to the archive database. By default, daily data is archived after 14 days.
Expire archive data. Enter the number of days after which daily archive should be purged from the archive database. By default, archive data is purged from the database after 92 days.
Resolve private address interval. When the NetFlow Monitor collector service encounters an IP address, it tries to determine information about the host attached to the IP address. After this information is resolved, it is stored in the NetFlow Monitor database. Enter the interval (in hours) that you want NetFlow Monitor to wait, before it checks the private IP address again, to resolve information that may have changed for the address. By default, private addresses are resolved every 48 hours.
Resolve public address interval. When the NetFlow Monitor collector service encounters an IP address, it tries to determine information about the host attached to the IP address. After this information is resolved, it is stored in the NetFlow Monitor database. Enter the interval (in hours) that you want NetFlow Monitor to wait, before it checks the public IP address again, to resolve information that may have changed on the address. By default, public addresses are resolved every 720 hours.
Tip: Because public IP addresses are less likely to be changed, you may want to use longer intervals than used for the Resolve private address interval option.
Expire unclassified traffic after. Enter the number of hours after which NetFlow Monitor should purge unclassified traffic. Unclassified traffic is traffic transmitting over ports that are currently not monitored by NetFlow Monitor. By default, unclassified traffic is expired after 1 hour.
Tip: You can prevent NetFlow Monitor from saving data about unclassified traffic by setting Expire unclassified traffic after to 0 (zero). When this option is set to 0 (zero), NetFlow Monitor aggregates and retains data for all unclassified ports as a single value; detailed information about the individual unclassified ports over which traffic was transmitted is immediately discarded.

Click OK to save changes.

Important: Any changes made to data roll up intervals are not enforced until the NetFlow Monitor collector service is restarted. For more information, see Stopping or restarting the collector.