When starting up a virtual machine with "xm create <machineName>" XEN does not  
properly set up bridging to this VM. Actually it seems to miss to  
call /etc/xen/scripts/vif-bridge. Calling this by hand enables networking for  
the newly created VM.  
  
VM Config:  
kernel = "/boot/vmlinuz-xen"  
ramdisk = "/boot/initrd-xen"  
memory = 256  
name = "test"  
disk = [ 'phy:/dev/system/test,hda1,w',  
         'phy:/dev/system/test-swap,hda2,w',  
         'phy:/dev/system/install,hdb1,r' ]  
root = "/dev/hda1 rw"  
nics = 1  
ip = "xxx.xxx.xxx.xxx"  
netmask = "255.255.255.192"  
vif = ['mac=AA:00:00:10:02:37, bridge=xenbr0']  
  
The system is a SuSE 9.3 minimal installation + XEN 2 updated to SuSE 10.0 +  
XEN 3.