Change IP address is Red Hat KDE

I have attempted to change my IP address , I have done everything.  I have edited both the network files in etc,  I even ran the netsetup commmand and still notihing, is there any way to do this through the GUI , any ideas, this linux box used to have a public IP and Now I am attempting to change it to private.. any ideas ?
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I would change it through the CLI:

edit /etc/sysconfig/network-scripts/ifcfg-eth0 and change the IP there.  Also change it in the /etc/hosts file.  Then run "/sbin/service network restart"

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For Redhat systems there is a Network Configuration interface that exists for this)

K->System settings-> Network
(alternatively run at the command line "redhat-config-network" in an X environment)
This is an administrative command and needs to be run as root!

Select the "Devices" tab.

Double click on interface that you wish to change.

Change settings as required.

Click OK.

Click deactivate.

Click Activate.

You should now have a new ipaddress.

Duncan RoeSoftware DeveloperCommented:
Be sure to change the type of address i.e. from dynamic (obtain address by DHCP) to static (use address that you specified)
Open the terminal and type setup

Go to network configuration and click on runtool

You'll get a graphical display to set up or change the network configuration
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