Configuring the Juniper Firewall Traffic Log (Policy Log)
Juniper Firewalls provide traffic logs to monitor and record the traffic that policies permit across the firewall. A traffic log notes the following elements for each session:
Date and time that the connection started
Source address and port number
Translated source address and port number
Destination address and port number
The duration of the session
The service used in the session
To log all traffic that a Juniper firewall device receives, you must enable the logging option for all policies.
To log specific traffic, enable logging only on policies that apply to that traffic.
The firewall generates logs when sessions end. However beginning with ScreenOS 5.2.0 and above, you also have the option to start logging at session initiation. Logging at session init will not show duration but it can be useful for troubleshooting purposes.
In the From drop-down menu, select the desired From and To zones. For example, in the From drop-down menu, click to select Trust. In the To drop-down menu, click to select Untrust.
Click New or Edit.
Click to select Logging.
By checking the first box, the security device generates logs when sessions end. By checking the 'at Session Beginning', the security device generate logs when sessions start. If both are selected, you will get both entries.
You can view traffic logs stored in flash storage on the Juniper firewall device through either the CLI or WebUI. You may also open or save the file to the location you specify, and then use an ASCII text editor (such as Notepad or WordPad) to view the file. Alternatively, you can send them to an external storage space, or include traffic logs with event logs sent by email to an administrator. To view the traffic logs through the WebUI, perform the following:
To view the Traffic Logs from the ScreenOS options menu, click Reports, and then select Policies. To view the Traffic Logs from the CLI, enter the command get log traffic <options>.