The configuration I've seen is to have not only guest accounts but also to have guest computers which are on a separate IP range, same with the guest wireless n

The configuration I've seen is to have not only guest accounts but also to have guest computers which are on a separate IP range, same with the guest wireless network. The important issue is actually what do the details of your license agreement say regarding guest users. Some state universities will actually request for this to specifically allowed since in many states it's considered, even if unofficially, a right of tax payers to have access if they need it