Hi. The v3700 is manageable via the local GUI or the CLI through that IP you have. Technically, it should have 3 IPs. One on each controller for the "service" connection and one "floating" IP for management. Are you logged into one of the "service" IP maybe? Where you can manage the storage unit but not create LUNs and the such?
As far as the software, I believe you may be thinking of "Storage Manager" which used to be a Windows' based installer that you could manage older "DS" storage arrays, like the DS5000, DCs3700 etc...
------------------------------
Stephan
------------------------------