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LEARN ABOUT HPUX

nfs_portmon

nfs_portmon(5)							File Formats Manual						    nfs_portmon(5)

NAME

       nfs_portmon - enable/disable the NFS server's source port verification check

VALUES

   Failsafe
   Default
   Allowed values
DESCRIPTION

       controls  some  security  checking that the NFS server can do in an attempt to enforce integrity on the part of its clients. The NFS server
       can check to see whether the source port from which a request was sent is a reserved port; a reserved port is a port whose port	number	is
       less  then  1024.  For BSD-based systems, these ports are reserved for processes being run by privileged users. This checking helps prevent
       users from writing their own RPC-based applications which defeat the access checking that the NFS server uses.

   Who Is Expected to Change This Tunable?
       The distributed file system administrator should examine the value of this parameter if he or she wishes to prevent  malicious  users  from
       gaining access to files by using an NFS server they would not ordinarily be able to access.

   Restrictions on Changing
       The tunable is dynamic; any change will take effect immediately on the running system.

       The reserved port notion is not universally supported. Therefore, interoperability problems might result if this checking is enabled.

   What Are the Side Effects of Enabling This Check?
       Some NFS clients may not be able to connect to the NFS server.

WARNINGS

       All  HP-UX kernel tunable parameters are release specific.  This parameter may be removed or have its meaning changed in future releases of
       HP-UX.

       Installation of optional kernel software, from HP or other vendors, may cause changes to tunable  parameter  values.   After  installation,
       some  tunable  parameters may no longer be at the default or recommended values.  For information about the effects of installation on tun-
       able values, consult the documentation for the kernel software being installed.	For information about optional kernel  software  that  was
       factory installed on your system, see at

AUTHOR

       was developed by Sun Microsystems, Inc.

SEE ALSO

       kctune(1M), sam(1M), gettune(2), settune(2).

							     Tunable Kernel Parameters						    nfs_portmon(5)