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===================
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Reporting Traffic
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===================
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Under :menuselection:`Reporting --> Traffic` you will find a traffic monitor which show the current amount of
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data flowing through your firewall, measured in bps (bits per second).
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.. image:: images/reporting_traffic_sample.png
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:width: 100%
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The top area of the screen shows an overview of all network adapters for both in- and outgoing traffic.
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The graph below shows the top consumers over the same timespan, when you point to a dot it will show you the measured
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bandwith for the selected host (the color matches the interface).
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.. Note::
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When an interface doesn't report traffic and you are certain there should be any, make sure to check if you have any
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services enabled that use netmap (zero copy) support on the selected interface (such as IPS and Sensei).
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When zero copy is used, packets won't by copied in the kernel in which case bpf can't read from the usual in memory buffer.
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:code:`bpf(4)` does support a zerocopy mode, in which case it will map the kernel memory pages directly
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(`freebsd/freebsd#310e3f9 <https://github.com/freebsd/freebsd/commit/310e3f93ddb4d35429a892af85c9b1cf4ef64ebe>`__),
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To enable, go to :menuselection:`System -> Settings -> Tunables` and add :code:`net.bpf.zerocopy_enable` set to :code:`1`
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Since this feature is marked experimental, the standard is not to use zero-copy.
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