Novell SUSE Linux Enterprise Server 10
The rcnetwork script is able to do that for the current session. It needs to be called in the following way to switch temporarily from NetworkManager to ifup:
rcnetwork restart -o netcontrol
To switch back to NetworkManager use:
rcnetwork restart -o nm
This does not affect the general setting for the network architecture. After a reboot it will switch back to the default setting selected with YaST. To switch to a different type permanently, use YaST.