Note that a firewalled node CAN BE a UltraPeer. What is really needed is to accept incoming connections on the configured port. This does not forbids firewalls or NAT routing devices.

Even in the 2 other examples shown as screenshots just above this message, it is really possible that two hosts (with distinct GUIDs) share a connection with the same visible IP, and even the same shared directories (which may be on a mounted local network shared disk).
For Gnutella, they may even be two distinct UltraPeers each one with its own set of connections. So they participate to the topology. Servents are not uniquely identified by their IP but also by their port number for incoming connections. As the first ping that is exchanged between connected host will contain this port number, they will be distinct.

I can't remember however if the two direct pongs exchanged contain the unique host GUID or just a unique GUID matching the ping request. If this is the unique host GUID (to be used in QueryHits and routing of pushes), then it should be possible to identify if two connections from the same IP belongs to the same host.

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