Icingaweb2 director configuration Master/Slave, how to do?

I’m sorry but I’m not able to understand what you’re trying to do. In general, satellites don’t talk to each other. A check is executed on master resp. satellite depending on the zone where a host is assigned to OR on an agent (where command_endpoint comes into play).

For example, http could be used to check a web server remotely means this kind of check is typically executed on a master or satellite. Whereas disk or load needs to be executed directly on a target machine means executed by the agent.

yes is similar, in all my satellites i add an host (the sensor gateway) and check are executed by satellite directly on it without agent but using check modbus on second network interface.

How can mange it by master machine? Master machine cannot reach directly the sensor gateway inerface

Looking at those concepts, can you tell me where the Director server is, or is the director running on the masters?

The director can only run on one master.