I'm past that problem now. I was able to set up both the target and the initiator on a virtual PC and I set up the initiator on my host OS. Now I am ready for the real deal. These are the two NAS devices that I have to make accesible as iSCSI targets:
Maxtor MaxAttach 4300
Compaq Storageworks NAS S1000
However, I don't really understand the NAS architecture. Should I build a server and attach the devices or how does that work?