Home > Storage > PowerScale (Isilon) > Product Documentation > Management and Migration > PowerScale OneFS User Mapping: Mapping Identities Across Authentication Providers > Exclusive ID ranges without overlap
In networks with multiple identity sources, such as LDAP and Active Directory with RFC 2307 attributes, you should ensure that UID and GID ranges do not overlap.
It is also important that the range from which OneFS automatically allocates UIDs and GIDs does not overlap with any other ID range. The range from which OneFS automatically allocates a UID and GID is 1,000,000 to 2,000,000.
If UIDs and GIDs overlap across two or more directory services, some users might gain access to other users’ directories and files.