What is the functionality of the firewall action "log"?

The functionality of the firewall action "log" is specifically designed to create a record of packets that meet certain criteria defined in the firewall rule. When the "log" action is applied, the MikroTik router captures information about the packet, such as its source and destination addresses, ports, and other relevant details, and writes this information to the log. This allows network administrators to monitor and analyze traffic for troubleshooting, security auditing, or compliance purposes.

The "log" action does not alter the packet; instead, it simply records information for review. Using this action without any additional conditions allows the administrator to track traffic patterns, potential security threats, or misconfigurations without interrupting the flow of data.

While other options may suggest additional actions like blocking packets or adding prefixes, these functionalities are not part of what the "log" action performs. Therefore, the primary focus of the "log" action is to document the packet activity rather than modify or drop the packets.