Dear Peter, >> interface (eth2) with some tun devices (for example, tun0, tun1, etc.) that >> are connected to interfaces inside a virtual machine running in the host > > Just a quick note here, tun interfaces are peer-to-peer IP > interfaces, it sounds like you would want tap interfaces instead > since they are peer-to-peer ethernet interfaces. The procedure that I use is specified in the UML documentation. In fact, I'm using something called TUN/TAP (the interface is created with the tunctl tool) (http://user-mode-linux.sourceforge.net/networking.html), but the difference between TUN/TAP is not very clear for me... (it always have worked, so I haven't digged into details too much :) But maybe I'm going a bit off-topic... :) Best regards, ------ Fermin