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Before you install the Real User Cloud Probe, you must configure the direct memory access (DMA) of the monitored network interface card (NIC). Typically, you will have to increase the receive (RX) and transfer (TX) ring buffer sizes on the NIC to accommodate a high traffic volume. You will also need to set the card to send all traffic to the CPU.

  1. Run the ifconfig command to see a list of the NICs on the system.

  2. Increase the buffer settings on the ethernet card by running the following ethtool commands:

    >ethtool -G eth<X> rx 4096
    >ethtool -G eth<X> tx 4096

    Replace eth<X> with the network interface card that is configured for the Cloud Probe, such as eth0 or eth1.

  3. Send all NIC traffic to the CPU by setting the promisc mode on the configured network interface:

    >ifconfig eth<X> promisc

    Replace eth<X> with the network interface card that is configured for the Cloud Probe, such as eth0 or eth1.

Note

Promiscuous mode is not mandatory when using Cloud Probe. For example, in case the traffic you need to capture is being sent to the same system where Cloud Probe is installed, the promiscuous mode is not needed. For more information on the Cloud Probe deployment, please see Cloud Probe deployment use cases.