Vlans:   X     X     Y
             -------------------------
             [ 1  |  2  |  3  | ...   ]
             -------------------------
               |     |     |
               |     |     |
               /     |     |
              /    eth1    eth0
     ---------       -------- 
    [ WIN box ]     [  Linux ]
     ---------      [  Bridge]
                     --------


Win: GW == vlanY_gw

Linux:
# brctl addbr br0
# brctl addif br0 eth0
# brctl addif br0 eth1

Goal: win box goes through Linux bridge for speaking to everybody