Sonos Digital Music System User Manual page 21

Chapter 2: ZonePlayer Setup and Operation
(see B in the diagram below).
Note: To maintain your computer's security, do not connect the ZonePlayer directly
to your cable/DSL modem.
2. If you don't have an open port on your router, you can disconnect your computer
from the router and connect it to the ZonePlayer instead. Then you can connect
the ZonePlayer into the router port the computer was previously plugged into.
2-3