34. Reports » Tools » Flows

The Reports » Tools panel contains the Flows item only when at least one Flow Sensor is in use. In this tab you can list, aggregate, filter, and sort flow records, generate traffic tops and statistics.

34.1. Flow Records

In this sub-tab you can list and filter flow data.

Sensor Interfaces – Select the interfaces that interest you. Guest accounts may have limited visibility
Flow Filtering Expression – You can enter a filtering expression for flows. Click the star icon on the right to open a window that shows the correct syntax. Frequently-used filtering expressions can be saved there and reused at any later time
Export – The output can be viewed in several formats such as HTML, TEXT, JSON or CSV, converted to PDF, emailed or printed. If you need to list very large amounts of flow data, doing it solely from the web browser is not a good idea because the page will timeout after a few minutes. In this case, select the CLI option to view the shell command used for listing flows. You can then execute that command from the shell and forward the output to a file
Time Range – Select a predefined time range, or select Custom… to enter a specific time interval in order to list only the flows that started or ended inside the interval. Time zone differences between the Console server and remote Flow Sensor servers are not adjusted automatically
Limit – Show only the first <number> flows. To list more than 50000 flows, use the CLI option from the Export menu
Aggregation – By default, flows are not aggregated. By checking the appropriate options, you can choose how to aggregate flows. You can aggregate entire subnets by selecting src(dst)IPv4(IPv6)/<subnet bits>
Sorting – When listing flows sent by different interfaces, you can sort them after the start time of the flows. Otherwise, the flows are listed in the order of the Sensor Interfaces
Display – You can select several predefined output formats, or you can enter your own format by selecting Custom…. Each predefined output format changes the options from the Display Options menu
Display Options – Click this button to choose how to display several columns. Check Include Unmonitored Ifs if you want to include flow data generated by interfaces not monitored by Flow Sensor

34.2. Flow Tops

In this sub-tab you can generate tops from flow data.

Sensor Interfaces – Select the interfaces that interest you. Guest accounts may have limited visibility
Flow Filtering Expression – You can enter a filtering expression for flows. Click the star icon on the right to open a window that shows the correct syntax. Frequently-used filtering expressions can be saved there and reused at any later time
Top Type – Select one of the items from the drop-down menu
Order By – Select the sorting unit
Export – The output can be viewed in several formats such as HTML, TEXT, JSON or CSV, converted to PDF, emailed or printed. If you need to list very large amounts of top data, doing it solely from the web browser is not a good idea because the page will timeout after a few minutes. In this case, select the CLI option to view the shell command used for generating the top. You can then execute that command from the shell and forward the output to a file
Time Range – Select a predefined time range, or select Custom… to enter a specific time interval in order to analyze only the flows that started or ended inside the interval. Time zone differences between the Console server and remote Flow Sensor servers are not adjusted automatically
Top – Limit the top listing to the first <number> records. To list more than 500 records, use the CLI option from the Export menu
Aggregation – By default, flows are not aggregated. By checking the appropriate options, you can select how to aggregate flows. You can aggregate entire subnets by selecting src(dst)IPv4(IPv6)/<subnet bits>
Limit – Limit the output to only those records whose packets or bytes match the specified condition
Display – You can select several predefined output formats, or you can enter your own format by selecting Custom…. Each predefined output format changes the options from the Display Options menu
Display Options – Click this button to choose how to display several columns. Check Include Unmonitored Ifs if you want to include flow data generated by interfaces not monitored by Flow Sensor