from the command line - long time ago.

First, let me explain what these net's are: instructions to the master as to how it can reach a system to install it, and v.v.

The easiest way to have nim networks work is to just give each network only a default route. However, if there a different router that must be used then think first in terms of the classic route statement, and what you would need to get to a system already operational. NIM uses nim_network routes to determine what route commands are needed to connect client and server (generally master).

on server/master :
route -net default default_router
route -net client_net client_net_specific_router

on client:
route -net default default_client_router
route -net nim_serverOrMaster_net nim_services_specific_route

So, for now, I suggest you check if two default routes, one for each networks are already sufficient. And only add networks if additional routes are needed for a specific communication path that the default routers cannot resolve.