Skip to main content
Splunk Lantern

Firewall data


Firewalls demarcate zones of different security policy. By controlling the flow of network traffic, firewalls act as gatekeepers collecting valuable data that might not be captured in other locations due to the firewall’s unique position as the gatekeeper to network traffic. Firewalls also execute security policy and thus may break applications using unusual or unauthorized network protocols.  Basic firewalls operate on layers 3 and 4 of the OSI model. Many modern firewalls can combine with other device functions and produce additional data, such as proxy and network intrusion detection data. 

Firewall data can provide visibility into which traffic is blocked and which traffic has passed through. Logs provide a detailed record of traffic between network segments, including source and destination IP addresses, ports and protocols, all of which are critical when investigating security incidents.

In the Common Information Model, proxy data is typically mapped to the Web data model.

Before looking at documentation for specific data sources, review the Splunk Docs information on general data ingestion: