Need to open a UDP port for WS

I must open a UDP port on a workstation VM. How can I do it? A service I’m trying to run within the vlan requires it (Galera).

I think it is EXTERNAL_UDP_OPEN_PORTS+=" 5300 "

This is going to be difficult to understand. Read this first:

“Open a port” is usually over onion services. Not directly from your clearnet IP. See also:

For better understanding of ports generally see:

Possibly alternatives:

onioncat (I don’t know latest project status).