Symantec 10521146 Administration Guide - Page 169
Enable TCP Checksum Validation, Advanced sensor parameters
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Detecting 169 Configuring sensor detection Enable TCP Checksum Validation Enable TCP Checksum Validation serves as the on/off switch enabling the sensor to validate TCP checksums. An TCP header unit generates a checksum, and transmits it with the unit. The sensor generates a second checksum and compares them. Matching checksums confirm that the sensor received the complete transmission. By default, this parameter is enabled. If you installed a Network Security software node on a computer with no checksum capability, you may choose to disable this parameter and enhance performance. 7100 Series appliances have checksum capability. Enable UDP Checksum Validation Enable UDP Checksum Validation serves as the on/off switch enabling the sensor to validate UDP checksums. An UDP header unit generates a checksum, and transmits it with the unit. The sensor generates a second checksum and compares them. Matching checksums confirm that the sensor received the complete transmission. By default, this parameter is enabled. If you installed a Network Security software node on a computer with no checksum capability, you may choose to disable this parameter and enhance performance. 7100 Series appliances have checksum capability. Advanced sensor parameters Symantec Network Security provides the following parameters for advanced troubleshooting purposes. Defaults are preset for optimum performance and sensitivity and do not need to be changed under most circumstances. Changing the default settings may impact performance, sensitivity, or both. ■ Packet Counter Interval ■ Streak Interval ■ TCP Minimum Flows ■ UDP Minimum Flows ■ TCP Number of Streak Packets ■ UDP Number of Streak Packets ■ Counter Number of Streak Packets ■ Saturation Counter Lapse Time ■ Maximum Time to Streak Analysis