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How to change a system name or IP address on SCO Unix.

© September 2000 Jeff Liebermann
November 1999 Many people land here from Google searches for how to change an ip address on SCO Unix. Jeff's article is more about other things you MIGHT have to change AFTER you change the ip address (although written for OSR5, Jeff's advice can be helpful on any Unix On all OSR5 and Open Desktop systems, "netconfig" (graphical or in character mode) lets you change the ip address. You will need to IT IS NOT ENOUGH TO JUST CHANGE /etc/hosts !!! You need to use netconfig.

Changing /etc/tcp will just cause you more grief - don't do it!

You also will probably need to edit the OLD address out of /etc/hosts after doing this. See Why do I get "portmapper is not responding" errors?

A related task is changing the default route. See How do I add a default route?

By the way, the trick to using netconfig or any of the SCO admin ("scoadmin") tools in character mode is to understand that the TAB key moves between panes - so to move from a sub-pane back to the menus, hit TAB and vice-versa.

Finally, this thread on ipf/ipnat might matter.

Rev 1.04 11/21/99
by Jeff Liebermann (jeffl@comix.santa-cruz.ca.us)
Latest version at: https://members.cruzio.com/~jeffl/sco/new_name.txt

Changing a name or IP address takes more than just running netconfig. There are far too many files that have system names, IP addresses, or both inside. I recently finished renaming a server. It took me 2 hours to get it straight and test the results.

The following is a list of files involved in renaming a server. I may have missed some as I was not running DNS or sendmail on this particular machine. Each file should be inspected for residue of the old name or IP address.

        /etc/tcp                        (symlinked to 2 other files)
        /etc/lmhosts                    (lan man only)
        /etc/ppphosts                   (ppp only)
        /etc/pppauth                    (ppp only)
        /etc/default/nbconf             (netbios configuration)
        /etc/hosts.equiv                (network security)
        /etc/hosts.lpd                  (rlp security)
        /etc/rc2.d/S91route             (setup default route)
        /etc/conf/cf.d/config.h         (created by idconfig relink)
        /etc/conf/cf.d/stune            (changed by uname -S new_name)
        /usr/lib/uucp/Permissions       (MYNAME=xyzxx)
        /usr/lib/uucp/Configuration     (MYNAME=xyzxx)
        /usr/mmdf/table/*               (numerous files)

You should also run:

        uname -S new_name

Be sure to rebuilt the kernel with:

        cd /etc/conf/cf.d

To change the IP address, the following files are also affected.


If you are running sendmail instead of MMDF, the pathalias databases and sendmail.cf should be edited.

If you are running DNS, you will need to edit:

and all the underlying databases.

If you have any networked printers, check:


If you use RARP to configure printers, check:


If you are running INN news, you will need to edit:

to change both the system name and various IP addresses used for NNTP.

If you are running an Apache web server, be sure to edit the system name(s) in:


If you have Vision FS, AFPS or Samba running, the peripherals on the server are known to MSDOS machines as:

Changing the server name will necessitate changing all the printer and filesystem shares.

If you have imbedded the "default server" or its IP address in any managed hubs, routers, print servers, bridges, or SNMP managed devices, these will need to be tweaked.

As you can see, renaming and reconfiguring the IP addresses of a server is not a trivial task. The chain of aliases are long and convoluted. Keep backup copies of all key files and a notepad with all the files that were tweaked.

© Jeff Liebermann (jeffl@comix.santa-cruz.ca.us) All rights reserved

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-> How to change a system name or IP address on SCO


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Fri Apr 29 18:20:21 2005: 410   anonymous

I have quickly changed IP Address thanks to this post

Wed May 18 19:08:11 2005: 540   anonymous

I need to change the IP address on my SCO Unix legacy computer to match network of my Windows workgroup. Found Jeff's article. But when I key 'netconfig' and use TAB to access the lower pane, that is as far as I can go. I cannot view or edit the hardware setups. I am logged in as 'root' with the master password. HELP!

Reply to: bob@savagebros.com

Wed May 18 20:11:40 2005: 545   TonyLawrence

You highlight the thing you want to change and then return to the top menu selections to modify it.

Thu Mar 15 07:47:17 2007: 2915   anonymous

5.0.5 and possibly 5.0.4 make sure you change the NODE tunable kernel parameter --
    /etc/conf/bin/idtune NODE "myservername"

Before relinking your kernel.

Tue Dec 7 05:00:06 2010: 9147   anonymous


very bad post! Doesn't tell you anything about how to change the ip address. just rambling about changing it but never tells you exactly how to change it. someone should have proof read this before posting it.

Tue Dec 7 12:22:56 2010: 9149   TonyLawrence


On the contrary, the very first sentence tells you "Changing a name or IP address takes more than just running netconfig".

You can actually pre-load netconfig by editing /etc/hosts and changing it there first, but you don't need to.

Thu Jan 16 20:36:34 2014: 12402   anonymous


you also have to change /etc/net/ticlts/hosts /etc/net/ticots/hosts /etc/net/ticotsord/hosts

Thu Jan 16 20:42:48 2014: 12403   TonyLawrence


Changing /etc/net/ticlts/hosts /etc/net/ticots/hosts /etc/net/ticotsord/hosts -

That would be true on Solaris, but not SCO

Mon Jan 27 11:31:28 2014: 12409   anonymous


If you donīt change this files on openserver 6 , at boot time you see,
rpcbind: Could not find any loopback transport. Exiting.
in sco doc (link)
If a message is displayed that states rpcbind is not running, check the name of the system (uname -n) with the entries in the /etc/net/*/hosts files, and see if they match.

If they do not match, your machine has had its name changed with the uname command, and the hostname entries in the /etc/net/*/hosts files must be manually updated.

Mon Jan 27 11:33:57 2014: 12410   TonyLawrence


This article is not about OSR6.

Mon Jan 27 11:40:46 2014: 12411   TonyLawrence


I know very little about OSR6 and don't want to know anything either :-)

This website will only be here a few more years. I'm pretty much retired now and and doing very little SCO work of any kind (and intensely disliking the little that I do). I'm not keeping up with it, I'm forgetting things and have no interest in keeping any of this up to date any more.


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