NFS: About/etc/exports

<Export>

The following methods can be used to specify host names:

Important:

Wildcards-where a * or? Character is used to take into account a grouping of fully qualified
Domain names that match a special string of letters. Wildcards shocould not be used with IP
Addresses; however, it is possible for them to work accidentally if reverse DNS lookups fail.
Chapter 19. Network File System (NFS)
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Be careful when using wildcards with fully qualified domain names, as they tend to be more exact
Than expected. For example, the use of * .example.com as a wildcard allows sales.example.com
To access an exported file system, but not bob.sales.example.com. To match both possibilities both
* .Example.com and *. * .example.com must be specified.
Important
By default, access control lists (ACLs) are supported by NFS under Red Hat Enterprise
Linux. To disable this feature, specify the no_acl option when exporting the file system.