The domain portion of the owner or owner_group attribute refers to a DNS domain name. For example,

user@us.ibm.com

For inbound mapping, the z/OS NFS server validates the domain portion of the owner or owner_group attribute .

• • The z/OS NFS server identifies the domain to be used to verify the domain portion of owner/group strings coming from the client. It does so as follows:

  If the nfsv4domain attribute was set, the z/OS NFS server uses it as its domain for NFSv4 name mapping; otherwise, the z/OS NFS server gets the domain from the TCP/IP stack which connects with the client; if the z/OS NFS server cannot get the domain from TCP/IP stack, it uses the default server domain. The z/OS NFS server compares this domain with the domain portion of the owner/group string that the server has received from the client.

• • If the domain portion of owner/group string is not valid, z/OS NFS server attempts to derive UID and GID from the RPC packet.

For outbound mapping z/OS NFS server puts the domain portion to the owner or owner_group attribute

• For an invalid translation, z/OS NFS server uses numeric string representation for outbound owner and owner_group attributes (without domain).