Technology for establishing network communications over an overlay network among nodes of configurable network computer systems, such as the storage system nodes of a hyper-converged infrastructure system is disclosed. The nodes are configured for communication over an overlay network and overlay endpoints corresponding to the nodes are enabled for encapsulating network communications between overlay endpoints. The nodes may then communicate over a common overlay subnetwork even though they operate in different local subnetworks with different subnetwork configurations. An installer may be similarly configured for network communications with the nodes over the overlay subnetwork.