Which value indicates UDP traffic that flows one way only?

The value that indicates UDP traffic flowing one way only is represented by Proto_state=00. In networking, particularly with regard to session states, this value signifies that there is no corresponding return traffic for the outbound UDP packets. Since UDP is connectionless, it does not establish a session like TCP, and thus traffic can indeed flow in only one direction without an acknowledgement.

In the context of network security and firewall rules, detecting one-way UDP traffic can be important for understanding communication patterns and potential vulnerabilities, such as when an application sends data without expecting a reply. Monitoring this type of traffic can help identify anomalies or potential misuse of services that utilize UDP.

Other values are associated with different session states that indicate either bidirectional flow or specific handling scenarios for packets that don’t align with the one-way flow represented by Proto_state=00. Understanding these distinctions is key in firewall management and configuration to ensure rules are created based on the behavior of the protocols being used.