Enable IP Security At Site Collection
On SharePoint Online you can whitelist specific IP ranges at the tenant level but this isn't necessarily granular enough. There are many instances where I would prefer to be able to force an IP restriction on a specific site collections so I can ensure that I outsider can't access the content or so I can treat the content as public (no login required) for specific sites but not the entire internet.
Jim K commented
I wish I could up vote for this more than once. This seems like critical functionality to secure a file server to sharepoint migration - e.g. it should only be accessed by employees at the office.
However, to also take advantage of the benefits of sharepoint (collaborating with external users) you should be able to lock down only designated site collections.
Thanks for the feedback. We're evaluating granular policies.
-Kavita Kamani, PM Manager, OneDrive and SharePoint