Ugh, for some stupid reason, RouterOS is now detecting my VirtualBox network interfaces in the wrong order. Actually, when I boot the image and print the interfaces, it doesn't show anything but ether0 for the first few seconds. The other two interfaces only come online afterwards. The first interface to come online is host-only and so is the other one among the two that come online late. The third interface is a bridge. There's no rhyme or reason to it.