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What is UNM (User Name Mapping) ?

April 26, 2017Mapping UNM user

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What is UNM (User Name Mapping) ?

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User Name Mapping (UNM) is method and tool used to map NFS UID’s and GID’s to Windows SID’s. This is the implementation of Identity Management (IdMU) mentioned in FAQ 6.03 above. Recall that NFS sends Unix a Unix UID and/or GID with each NFS communications package for identification and permission purposes. The UID’s and GID’s are usually maintained by the system administrator to be unique within the network that the NFS fileystems are being served. Windows uses a SID (Security IDentifier) which is much larger (more bits) than a UID/GID and is unique by machine/domain. To mesh these two ID methods together UNM is used to map UID/GID’s to SID’s and the reverse. UNM is available as part of Service for Unix (SFU) 3.0 and 3.5 which can run on Windows 2000, Windows XP, Server 2003 and Server 2003/R2. Server 2003/R2 is the last Windows release to support UNM. Replacing UNM starting with Server 2003/R2 is RFC2307 in Active Directory (AD).