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====== TCP and UDP Protocol Blocking Configuration ======
The parameter ''udp_block'' is responsible for blocking the UDP protocol. If the ''udp_block'' parameter is present in the DPI configuration file ''/etc/dpi/fastdpi.conf'', both TCP and UDP will be blocked; if absent, only TCP will be blocked.

To start blocking UDP protocols (e.g., QUIC), add the ''udp_block'' parameter with a value of 2 or 3 (start blocking after two or three passed packets). These values are set because sometimes a large number of individual packets pass, which are not accounted for in the traffic but can put a heavy load on DPI.
<code bash>udp_block=3</code>

Adding the parameter does not require a DPI restart; a simple reload is sufficient:
<code bash>
service fastdpi reload
</code>