Filtering UDP Frames

Napatech Link-Capture™ Software Getting Started Guide
Platform
Napatech SmartNIC
Content Type
Getting Started
Capture Software Version
Link™ Capture Software 12.16

Use this information to configure a filter that captures UDP frames.

It is possible to set up a filter, filtering frames based on the protocol information. This example shows how to set up a filter to capture UDP frames. This figure shows the test setup.

Figure 1. Setup overview for filtering UDP frames
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Port 0 of the SmartNIC is connected to the traffic generator.

  1. Create a file with the following NTPL commands. 
    Delete = All
Assign[StreamId=0] = Layer4Protocol==UDP
    Apply the configuration. For example:
    /opt/napatech3/bin/ntpl -f config.ntpl
    An output example:
    NTPL CMD: Delete = All
NTPL ID:    0NTPL CMD: Delete = All
NTPL ID:    0
NTPL CMD: Assign[StreamId=0] = Layer4Protocol==UDP
NTPL ID:    3
  2. Start the monitoring tool. 
    /opt/napatech3/bin/monitoring
  3. Start throughput. 
    /opt/napatech3/bin/throughput -s 0
  4. Transmit 10,000 UDP frames on the traffic generator.
  5. Stop throughput and check the output.
    An output example:
    Throughput:  0 packets @         0 pps,  0 packets dropped,   Wire:     0.000 Mb
...
Throughput:  10000 packets @     10000 pps,  0 packets dropped,   Wire:    63.39
Throughput:  10000 packets @         0 pps,  0 packets dropped,   Wire:     0.00
...
Done:  Received: 10000 packets   Wire: 7924585 bytes   Pci: 8084585 bytes   Dropped: 0 packets  0 bytes

Max throughput:      10000 pps  Wire:    63.396 Mbps  Pci:    64.676 Mbps
Min throughput:          0 pps  Wire:     0.000 Mbps  Pci:     0.000 Mbps
Avg throughput:       1000 pps  Wire:     6.339 Mbps  Pci:     6.467 Mbps

Total throughput:  Received: 10000 packets   Wire: 7924585 bytes   Pci: 8084585 bytes   Dropped: 0 packets  0 bytes
  6. Check the statistics in the monitoring tool.

UDP frames are filtered and delivered to stream 0.