+.TP
+.B \-g " or " \-\-manage-gids
+Accept requests from the kernel to map user id numbers into lists of
+group id numbers for use in access control. An NFS request will
+normally (except when using Kerberos or other cryptographic
+authentication) contains a user-id and a list of group-ids. Due to a
+limitation in the NFS protocol, at most 16 groups ids can be listed.
+If you use the
+.B \-g
+flag, then the list of group ids received from the client will be
+replaced by a list of group ids determined by an appropriate lookup on
+the server. Note that the 'primary' group id is not affected so a
+.I newgroup
+command on the client will still be effective. This function requires
+a Linux Kernel with version at least 2.6.21.
+
+.SH TCP_WRAPPERS SUPPORT
+This
+.B rpc.mountd
+version is protected by the
+.B tcp_wrapper
+library. You have to give the clients access to
+.B rpc.mountd
+if they should be allowed to use it. To allow connects from clients of
+the .bar.com domain you could use the following line in /etc/hosts.allow:
+
+mountd: .bar.com
+
+You have to use the daemon name
+.B mountd
+for the daemon name (even if the binary has a different name).
+
+For further information please have a look at the
+.BR tcpd (8)
+and
+.BR hosts_access (5)
+manual pages.
+