Which session flag indicates that a packet cannot be offloaded to the NPU?

The session flag indicating that a packet cannot be offloaded to the Network Processing Unit (NPU) is associated with the "npd" flag. This flag is specifically used in the context of processing packets that require handling by the CPU rather than being optimized and processed by the dedicated hardware resources, like the NPU.

When a packet is marked with the "npd" flag, it signifies that there are conditions or configurations in place that prevent efficient offloading. This might occur due to specific inspection requirements, session awareness needed from the firewall, or other packet attributes that necessitate a deeper level of analysis by the CPU.

Other flags mentioned, such as "local," "br," and "log," serve different purposes within firewall session handling and do not specifically indicate offloading capabilities or restrictions concerning the NPU. Understanding the "npd" flag is important for network security professionals as it impacts performance by dictating how packets are processed in terms of resource utilization.