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I believe this is partly answered by #q295400.

I believe this is partly answered by #q295400.

Especially the RTI documentation linked in that answer provides quite some detail: What network port numbers does RTI Connext use?

I believe this is partly answered by #q295400.

Especially the RTI documentation linked in that answer provides quite some detail: What network port numbers does RTI Connext use? .

And from Statically configure a Firewall to let OMG DDS Traffic through:

By default, each DomainParticipant opens 4 UDP/IP ports: Two of those ports are multicast ports which are shared among all domain participants in the same DomainId. The other two are unicast ports which are different for each participant within a computer.