The following diagram shows an example system.
The system contains network 10.10.10.0/24, which has a central Resource Manager server, and is therefore the default network. The default network is treated exactly the same as a Resource Manager system without the ZenPacks.zenoss.MultiRealmIP ZenPack installed.
The system also contains network r1 and network r2. These networks are behind a firewall and have the same IP space, 192.168.0.0/24. Each realm has a distributed collector. The Resource Manager server accesses the collector by using an IP translation from the firewall to map the address that is accessible from in front of the firewall to an address that is behind the firewall. Remote collectors in a multi-realm setup must be accessible from the central server using SSH.