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.

udp_block=3

Adding the parameter does not require a DPI restart; a simple reload is sufficient:

service fastdpi reload