Dtune(4)                                                    Dtune(4)


       NAME
             Dtune - tunable parameter descriptions for graphical interface

       SYNOPSIS
             Dtune

       DESCRIPTION
             A Dtune file is one of the Installable Driver/Tunable
             Parameters kernel configuration files.  It contains
             descriptions of tunable parameters.  When the Dtune component
             of a module's Driver Software Package (DSP) is installed,
             idinstall(1M) stores the module's Dtune file information in
             /etc/conf/dtune.d/module-name, where the file module-name is
             the name of the module being installed.  Package scripts
             should never access /etc/conf/dtune.d files directly; instead
             use the idinstall and idtune commands.

             For each integer and string tunable parameter in an Mtune file
             there is an associated Dtune entry.

             Special lines are identified by one or more percent signs (%)
             followed by a space at the start of a line.

                  %%    Identifies the highest level category of tunable
                        parameters.  This heading line is used for the
                        initial display of the System_Tuner available
                        through the UnixWare desktop.

                  %%%   Identifies a sub-category of tunable parameters.
                        Additional %s can be used to create an hierarchy of
                        categories.

                  %     Identifies the tunable parameter.  This line is
                        followed by one or more lines of text that describe
                        the specific tunable parameter.

                  %C    This line identifies the text for a category
                        description.  The category must match the category
                        on another line that starts with a minimum of two
                        %s.

             For more information about tunable parameters, see the System
             Administration guide chapter on tunable parameters.





                           Copyright 1994 Novell, Inc.               Page 1

      Dtune(4)                                                    Dtune(4)


      EXAMPLES
            The following is an example of a Dtune file:

            %% Networking Parameters
            %C Networking Parameters
            There are several categories of Networking Parameters
            including Internet Control Message Protocol (ICMP),
            Internet Protocol (IP), and
            Transport Control Protocol (TCP).
            %%% Internet Protocol (IP) Parameters
            % IPCKSUM
            Controls whether IP (Internet Protocol) checksumming is enabled.
            By default, IP checksumming is turned on (set to non-zero).
            Except when the underlying hardware
            guarantees correct and uncorrupted delivery of all packets,
            this parameter should remain turned on.
            % IPFORWARDING
            Controls whether ip will forward packets;
            that is, whether it will act as a gateway.
            This parameter should be turned on (set to non-zero)
            only if the machine is intended to be a gateway.
            % IPSENDREDIRECTS
            Controls whether ip will generate ICMP (Internet Control Message Protocol)
            redirect messages
            when forwarding packets to a destination
            that the sender should be able to reach directly.
            This should be turned on (set to non-zero)
            only if needed to support diskless workstations,
            or if the machine is acting as a router or gateway.

      REFERENCES
            Mtune(4)

      NOTICES
            The UnixWare 2.0 System Tuner displays only one level of
            category.












                          Copyright 1994 Novell, Inc.               Page 2