There is a file in your home directory called .profile .

The above post recommends you add a line to it ( ifup eth1 ) which enables your network card. You could also add a line before that ( ifdown eth0 ) which would shut down your network card. This would in theory simulate what you are doing in the guitar. Essentially it's a script or batch file that will run that command at boot which in theory is the same as disabling and enabling your network card that you are doing to make your network work.

It's a workaround not a solution for why it's happening but it will make your virtual machine function on boot up.