The following figure gives an example of how such a cross-organization network could be structured:
The four project partners in the example all have an internal network of RCE instances which are connected by standard RCE connections. Uplink connections to a relay server are used to connect between the different partners. The relay server is located outside of the organizations networks, and only the relay server has to be reachable via SSH over the internet. Typically, for each organization one RCE instance (called SSH gateway) established an SSH connections to this relay server. All other instances in the institution’s internal network can be connected to it by standard RCE connections and still publish tools to the other partners/ access tools published by other partners.
Each institution in the example has a different internal setup, all of which are possible:
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Partner A has a dedicated RCE server where the published tools are located, which is connected to the SSH gateway by an RCE connection. All other RCE users in the internal network are connected to this server
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Partner B has put all the tools directly on the SSH gateway instance.
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In Partner C's network, some tools are located on the SSH gateway, but some tools are also published by users directly on their own machines. As long as they are connected to the SSH gateway also those tools can be published to the other partners.
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Partner D has no tool server, instead the users’ computers connect directly to the relay server.