MacOS and Linux can share one IP number by using masquerading techniques. This will be documented here eventually. The config file could look something like:

MacOS will see two ethernet devices. One is connected to the tap device and the other is using the sheep_net driver. AppleTalk should be configured (in MacOS) to use the second device (routing AppleTalk is non-trivial and creates an extra Zone this is avoided by using the sheep_net driver for AppleTalk traffic).

More documentation will be added later...