It sounds like NetworkManager was installed. To check to see if it was installed run:
Code:
[root] # rpm -qa --last |less
That will give you a list and date of all packages installed and when they were installed.
If it did get installed try running NetworkManager and see if it will allow you to get on then.
Code:
[root] # /usr/sbin/NetworkManager
It should put an icon in the upper right corner next to the updates icon.
Right click on the icon and select Edit Connections.
Put in your network information and it should work again.
You want to make sure it comes up when you restart the machine so you will want to do this :
Code:
[root] # chkconfig NetworkManager on
If that does not work you may want to remove NetworkManager from the system.