This is kind of weird problem When I create a new guest machine, I use wifi as my internet connection on my real computer. After the creation, I boot up the new machine and I'm still using wifi on my real computer. No problem up to this point. I turn off the guest machine and turn off wifi, using ethernet as my internet connection. My internet is working fine on my real computer at this point. Also, I didn't make any change except I only add "kernel.waet.enable=0" so the new machine can boot up properly. I boot up the guest machine again. The problem occures: I can't connect to internet. I have tried every choice in the network card configuration. I still can't connect to internet. I turn off the guest machine, unplug the ethernet cable, and turn on the wifi. I boot up the guest machine again. Now the guest machine got internet connection.