title: RFC or something for choosing private ethernet MAC addresses?
body: <p>for virtualization purposes I want to assign all my VM ethernet cards an individual static MAC-address. This way it is easier for me to manage DHCP.</p>
  
  <p>Normally ESXi Server chooses an address with this prefix: 00:50:56
  But I don't want to use this prefix to don't get problems with later/other auto generated MACs or later joining VMs.</p>
  
  <p>The VMs are only connected via NAT to the Internet, so the MAC will stay private.</p>
  
  <p>Is there a guideline which MAC to choose?<br>
  Something like a private MAC address space?<br>
  Or should I just choose a random one?</p>