Q:

Can I limit access to storage by subnet

With AWS, I can set a restriction to limit access to a bucket from specific IP addresses.  This is important if you want to allow staff to access buckets from specific corporate systems ( or while connected via VPN ) while denying them from their personal systems.  Can we do the same in Google Cloud Storage? 

A:

No.  IP filtering for bucket access control is currently not supported, however a Feature request has been submitted for this to be included and supported. 