I have two machines that have joined the zerotier network. Their assigned IPs in the zerotier network are 192.168.21.22 and 192.168.28.29. Now I want to make a one-way connection between the two machines. It requires that 192.168.28.29 can access all ports of 192.168.21.22, but conversely 192.168.28.29 absolutely cannot access 192.168.21.22.
How should I write this Flow Rules? Can you provide me with an example?