I'm no pro, but I'll give this a try...
Have you tried mounting from the command line? Try it and see what happens.
From your SuSE box try:
cd /
mkdir SHARE
SMBMOUNT //smeservername/sharename /SHARE -o username=username,password=password
If that doens't work, replace the servername with the LAN IP of the SME server and try it again.
See what that gives you. It should work from either machine to the other.