By default, most networks will not route multicast traffic like
sACN, so in that sense you could say it's "limited to layer 2". That's not really a limitation of the
protocol, however, just of the
network. With the right
router and configuration, it is possible to route
sACN within a LAN. If you're thinking of sending it over the internet, there are better options. Either a VPN or a more specialized service like
Streamweaver is one approach to allow the
sACN source to be across the internet from what it's controlling. You could also consider a remote desktop approach to allow for remote control of an
sACN source that is local to what it's controlling. That works better for things like Nomad running on a computer rather than actual light boards (since you typically can't install the remote desktop software on a
console). The main advantage to keeping the
sACN source local to the controlled devices is to reduce
latency and packet loss. That's more critical for
dynamic effects than lights that will mostly be sitting at a static
level/color while in use.
So... what is it you're trying to accomplish?