A problem I've had with wireless in SuSE is that you need to shut down other network interfaces you may have up. SuSE gets confused.
So, if you have, eg eth0, you should
ifdown eth0
then reinitialize the wireless card
/etc/init.d/pcmcia restart
(I hope that's a pcmcia card you have!)
finally, you will need to make sure that the firewall is targetting the right device. Using YaST, you can only choose one. If you have the right device (wlan0) selected, you can
SuSEfirewall2
from the console once the card has it's IP address etc.
In the end, I set up my onboard NIC to be manual because I was just using the wireless card. You can do this in /etc/sysconfig/network/ifcfg-eth0 by adding/changing
STARTMODE='manual'
Then if you don't have the wireless card plugged in, you can just
ifup eth0
hth
ws
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