How-to: Configuring OS vs. Native Mode on Napatech NICs

When using the Napatech network cards, you may want to switch between OS mode (which allows you to interface with the device using standard linux tools), and Native mode (which is designed to support continuous and high data rate captures). This how-to guide explains the configuration necessary to operate in these different modes. This is accomplished by swapping the configuration file located in the following directory:

$ /opt/napatech3/config/ntservice.ini

Note

The latest versions of the Napatech files required are available on our github page.

1. Configuring OS Mode

To configure OS mode on the network card, copy of the osmode version configuration file to the configuration file directory using the following command:

$ cp /opt/napatech3/config/ntservice-osmode.ini /opt/napatech3/config/ntservice.ini

Then, reboot your computer.

2. Configuring Native Mode

For maximum capture bandwidth, you’ll want to configure the network card to native mode. This is done by copying the native mode version configuration file to the configuration file directory using the following command:

$ cp /opt/napatech3/config/ntservice-native.ini /opt/napatech3/config/ntservice.ini

Then, reboot your computer.

Note

After configuring the device in native mode, you will be unable to use gnuradio or similar tools. Instead, you’ll need to use the tools specified for wideband capture mode, as discussed on the wideband streaming how-to guide.