How to check if zero tier restricts data properly to specific ports?

Hi! Noob here. Would like to ask how to check if the flowrules I added are working properly? I looked it up and something like

accept ipprotocol tcp and dport <port>;

drop chr tcp_syn and not chr tcp_ack;

was what was recommended. I added this and the flow rules JSON was updated properly as well but I have no idea if its working or not. I'm trying to limit it to specific ports for our games' dedicated servers.

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Thanks!