> I think CRDT make no difference to the problem referred to here, which
> is that two machines, each behind its own firewall will have difficulty
> talking to each other unless they go through some external server (at
> least to set up the initial connection).  There are *partial* solutions in
> the form of ICE/STUN.

I see, or maybe we could run it on existing p2p network e.g. IRC?