first try using the console/terminal ifconfig -a command (to see what interfaces are running)
then ifconfig "eth1" up (not the quotes) + shld bring eth1 with no ip address - mind you
ifconfig -a (shows all interfaces) or (ifconfig eth1 - on its own)
then try route or netstat -nr (to see your interfaces via the route or netstat command)
once eth1 is up
dhclient eth1 (on mandriva boxes) not sure what suse equivalent is so
try your Yast gui to initial eth1 again.
hope these work for suse 10, else your'll have to read up like the rest of us.
cant see it being a major problem keep reading