mysql-cluster firewall

Hi, i need some help with firewall with mysql-clusters.

I have mysql-cluster with 1 mgm, 3 nodes and 2 apis, and i need to open

some ports on firewall to mysql communicate each other, but the ports
of mysql-clusters
openned is random.

Can i fix this port numbers in mysql-cluster configuration? Or open an
port-range? Some solution?

Thank you!