Most routers in a standard setup will allow a 640H to connect both to radio stations and FreeDB, since the ports and protocols the 640H uses are standard as well.
In case a user needs to specifically open ports on a router for the 640H, the ones to look for are:
- TCP port 80 (http), for connecting to radio stations and FreeDB
- TCP port 1755 (mmst), for connecting to some radio stations
- TCP port 53 (dns), used for domain name lookups by iRadio and FreeDB
A note on iRadio; it is ultimately up to the radio broadcaster to decide which port to broadcast from, but using different port numbers than those above is considered bad practice.