Take a Packet Capture for Unknown Applications
Table of Contents
Take a Packet Capture for Unknown Applications
Palo Alto Networks firewalls automatically
generate a packet capture for sessions that contain an application
that the firewall cannot identify. Typically, the only applications
that are classified as unknown traffic—tcp, udp, or non-syn-tcp—are
commercially available applications that do not yet have App-ID signatures,
are internal or custom applications on your network, or potential
threats. You can use these packet captures to gather more context
related to the unknown application or use the information to analyze
the traffic for potential threats. You can also Manage Custom or Unknown Applications by
controlling them through security policy or by writing a custom
application signature and then creating a security rule based on the
custom signature. If the application is a commercial application,
you can submit the packet capture to Palo Alto Networks to have
an App-ID signature created.
- Verify that unknown application packet capture is enabled (this option is enabled by default).
- To view the unknown application capture setting, run the following CLI command:
admin@PA-220>show running application setting | match “Unknown capture”If the unknown capture setting option is off, enable it:admin@PA-220>set application dump-unknown yesLocate unknown TCP and UDP applications by filtering the traffic logs.- Select .Click Add Filter, create the unknown TCP portion of the filter (Connector = “and”, Attribute = “Application”, Operator = “equal”, and enter “unknown-tcp” as the Value), and then click Add to add the query to the filter.
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Create the unknown UDP portion of the filter (Connector = “or”, Attribute = “Application”, Operator = “equal”, and enter “unknown-udp” as the Value), and then click Add to add the query to the filter.![]()
Click Apply to place the filter in the log screen query field.Click the Apply Filter arrow next to the query field to run the filter and then click the packet capture iconto view the packet capture or Export it to your local system.![]()
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