Setting up the monitored NIC for the Cloud Probe in a Linux system
You must configure the direct memory access (DMA) of the monitored network interface card (NIC) if you are installing the Real User Cloud Probe:
- In a Linux system
- With a dedicated server that receives the traffic feed
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.
Run the
ifconfig
or theip link
commands to see a list of the NICs on the system.Increase the buffer settings on the ethernet card byrunning the
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 aseth0
oreth1
.Send all NIC traffic to the CPU by setting the
promisc
mode on the configured network interface:ifconfig
command>ifconfig eth<X> promisc
ip link
command>ip link set eth<X> promisc on
Replace
eth<X>
with the network interface card that is configured for the Cloud Probe, such aseth0
oreth1
.
Note
The Promiscuous mode is not mandatory when using Cloud Probe. For example, the promiscuous mode is not needed if the traffic you need to capture is being sent to the same system where the Cloud Probe is installed. For more information on the Cloud Probe deployment, see Cloud Probe deployment use cases.
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