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Monitoring Content Filtering Events

 

Purpose

Use this page to view information about security events based on content filtering policies. The event viewer provides a view of all content filtering events and how the events are handled by content filter. This page can be used to view traffic on the network in real time or as a debugging tool to view how content filtering is operating.

Content filtering provides basic data loss prevention functionality. Content filtering screens traffic based on MIME type, file extension, protocol commands, and embedded object type. It either permits or blocks specific commands or extensions on a protocol-by-protocol basis.

Starting in Junos OS Release 19.1R1, Content Filtering option is available for logical system users.

Action

To monitor events select Monitor>Events>Content Filtering in the J-Web user interface.

Meaning

Time Range graph displays the trend of all events or flow for all the events that has transpired in the device.

You can specify the duration of time for which you want to view the trend for all events. The available options are 30m, 1h, 2h,…, and so on, which are displayed at the top right hand side of the page. For example, if you choose 30m, the end time is the current system time and the start time is the preceding 30 minutes from the current system time.

Click Custom to specify a customized time range. The Custom Time Range Selection popup window is presented. You can set the from and to date and time, and click OK to set the time range.

To refresh the graph on demand, click the refresh button.

You can also drag the slider in the Time Range graph from the extreme left or right of the graph and set the time range to see the trend or flow of events that has transpired in that time range.

There are two ways to view your data. You can select either the Summary View tab or the Detailed View tab.

The Summary View is selected by default, and it gives a brief summary of all the Content Filtering events in your network.

The data presented in the line graph (also known as swim lanes) is refreshed automatically based on the selected time range. The line graph shows light blue lanes that represent all Content Filtering events.

Below the swim lanes are widgets displaying critical information such as top five sources, top reasons, and top blocked protocol commands.

See Table 1 for descriptions of the widgets.

Table 1: Widgets in Summary View

Widget Name

Displays

Top Sources

Top five source IP addresses of the network traffic; sorted by event count.

Top Reasons

Adds respective content for display column.

Top Blocked Protocol Commands

Adds respective content for display column.

Click the Detailed View for comprehensive details of events in a grid format that includes sortable columns. It displays information in grids that are lazy loaded with infinite scrolling. You can narrow down your search to a particular event based on Event-Name, Source-Address, Reason, or Profile. The table includes information such as event name, description, source IP, reason, profile, and how and when the event was detected.

Table 2: Filter Options in Detailed View

The dropdown filter that is displayed above the grids.

Options available in the filter dropdown are: event-name, source-address, destination-address, Source-Name, User, Role, Reason, Profile, Protocol, and Category for dropdown filter.

Select the criteria or parameter on which you want to construct the filter statement.

Text box

Displays the filter parameter that you selected from the filter dropdown.

Note:

In the filter statement the following limitation exists.

  • You can use only one operator at a time.

  • You can use only one instance of the criteria or paramenter in one filter statement.

For example, if you have used & operator and the parameter Event-Name once, I cannot use them again in the same filter statement

CORRECT USAGE: Event-Name = rt_flow_session_close & application=TELNET

WRONG USAGE:Event-Name = rt_flow_session_close & Event-Name = rt_flow_session_create

WRONG USAGE:Event-Name = rt_flow_session_close & source-address = x.x.x.x & application = TELNET

Note: The filter statement is NOT case-sensitive.

Add the parameter for which you want to filter. For example, in the dropdown filter if you selected event-name as the parameter, the text box displays Event-Name =. If you add CONTENT-FILTERING-BLOCKED-MT to see only Content Filtering events then the text box displays Event Name = CONTENT-FILTERING-BLOCKED-MT.

Go

Executes the filter statement that is displayed in the text box.

Click Go.

X

Clears the filters.

Click x.

Show Hide Column Filter icon represented by three vertical dots

Enables you to show or hide a column in the grid.

The Table 3 describes the grid information displayed in the Detailed View.

Table 3: Content Filtering Events - Grid Elements in Detailed View

Grid Element

Description

Event Name

The event name of the log.

Description

The description of the log.

UTM Category or Virus Name

The UTM category or name of the virus.

Event category

The event category of the log.

Source IP

The source IP address from where the event occurred.

Hostname

The host name in the log.

SourceZone

User traffic received from the zone.

Roles

Role names associated with the event.

Reason

The reason for the log generation. For example, a connection tear down may have an associated reason such as authentication failed.

URL

Accessed URL name that triggered the event.

Action

Action taken for the event: warning, allow, and block.

Proflie Name

Profile name in the log.

Time

The time when the log was received.

Release History Table
Release
Description
Starting in Junos OS Release 19.1R1, Content Filtering option is available for logical system users.