Observer Analyzer : Observer Analyzer : Troubleshooting common issues : Integrated adapters report all sent packets with bad TCP checksum
Integrated adapters report all sent packets with bad TCP checksum
Symptoms: All TCP packets sent from Observer or probe station across an integrated network adapter contain bad TCP checksums.
Causes: Default driver settings for the card are incorrect. You must update the driver and then disable the “Offload Transmit TCP Checksum” option.
Solutions: Upgrade the driver for the integrated network adapter to the Network Instruments/Intel Pro 1000 adapter driver. This driver is located in the:\<Observer installation directory>\Drivers\IntelPro1000 directory.
1. After upgrading the driver, right-click the adapter and go to Control Panel > Network Connections > Properties.
2. On the General tab, click the Configure button.
3. Click the Advanced tab and find the Offload Transmit TCP Checksum option and disable it.
4. Restart your system.