Dear Diego.
Indeed there is an issue with the content of the documentation.
Supported command-line options are listed
here.
The network configuration is currently supported by the Hazelcast library itself. Janus does not provide a specific CLI interface.
You have to take a look on the Hazelcast document in order to determine what is the best property to define for solving your problem.
I may also indicate to you that a new version of the SRE is planned for the next release. The network support will be better and with specific CLI options.