Distribution with Mnesia

[Marc Ernst Eddy van Woerkom]

The features of Mnesia, as described in the docs, are remarkable.

But what exactly is its useful grade of distribution?

Is it just usuable for a well defined group (not changing too
much in time) of nodes that are kind of close together (e.g.
in the same corporate LAN or WAN?

The other extreme would be a kind of P2P setting,
with lots nodes that join and leave the net in an 
unpredictable fashion.

Or not so extme:

Would it allow connecting let's say 10 servers
via the internet?
Would inter node metadata flow be possible over
encrypted channels?

Regards,
Marc