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======UDP Traffic Processing Configuration======

The ''udp_block'' parameter is responsible for blocking the UDP protocol for services that primarily process TCP traffic while allowing UDP traffic to pass through without processing. \\

Examples of such services:
  * Service 4 [[dpi:dpi_options:opt_filtration|]]
  * Services 5 and 16 [[dpi:dpi_options:opt_capture|]]

If the ''udp_block'' parameter is present in the DPI configuration file ''/etc/dpi/fastdpi.conf'', both TCP and UDP traffic are blocked. If the parameter is absent, only TCP traffic is blocked.

To start blocking UDP protocols (for example, QUIC), add the ''udp_block'' parameter with the value ''2'' or ''3'' to the configuration file (start blocking after two or three UDP packets have passed). It is also possible to start processing from the very first UDP packet, but this may increase the load on the DPI during a DDoS attack.

<code bash>
udp_block=3
</code>

Adding the parameter does not require restarting the DPI. It is sufficient to perform a reload:

<code bash>
service fastdpi reload
</code>

To completely disable UDP traffic processing:

<code bash>
only_tcp=1
</code>

Default value: ''only_tcp=0'' — UDP traffic processing is enabled.