SCO Unix TCP/IP and NFS FAQ

This article is from a FAQ concerning SCO operating systems. While some of the information may be applicable to any OS, or any Unix or Linux OS, it may be specific to SCO Xenix, Open This is an old article about SCO Unix and is only left here for historical purposes. There is lots of Linux, Mac OS X and general Unix info elsewhere on this site: Search this site is the best way to find anything.

How can I force the link speed and duplex settings of my NIC (or check what it is now) on SCO Unix ?

See also I don't understand all this half/full duplex negotiation stuff

You can check the settings with ndstat -l.

You may find that you can change settings under the Advanced tab of Modify Hardware Configuration in netconfig.

If not, check the space.c file for the driver. For example, for the e3H driver, you'd look in /etc/conf/pack.d/e3H/space.c and you'd find this section:

 /* 
        Media type (ie. speed and half/full duplex) can be specified.
     See space.h for appropriate values
  */
 short e3H_Media_Override[4] = {
        MEDIA_OVERRIDE_DEFAULT, 
        MEDIA_OVERRIDE_DEFAULT,
        MEDIA_OVERRIDE_DEFAULT,
        MEDIA_OVERRIDE_DEFAULT
 };
 

And in space.h you'd find this:

 
 /*
        Media type may be overridden.  Default is to let the NIC determine the
        speed and duplex mode.  
 */
 #define MEDIA_OVERRIDE_DEFAULT 0
 #define MEDIA_OVERRIDE_NONE    0
 #define MEDIA_OVERRIDE_AUTO    1
 #define MEDIA_OVERRIDE_100_HALF        2
 #define MEDIA_OVERRIDE_100_FULL        3
 #define MEDIA_OVERRIDE_10_HALF 4
 #define MEDIA_OVERRIDE_10_FULL 5
 

You could change space.c to reflect what you want to force, and then relink a new kernel and reboot.

See also (thanks Bill Vermillion): https://www.cisco.com/warp/public/473/46.html

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