I do not know if this will work. However you can change the system settings
using the files in /etc/sysconfig. After Changing the values run
SuSEconfig.
YAST also operates on/with those files.
What parameter exactly would you like to set for your network card ?
You may use mii-diag for example (make sure the netiag package is installed)!
You may also take a look on:
http://yast2.suse.com/