You'll need to connect the player to a network hub/switch -- there are ways to get it working connected directly to a PC, but it's a bit more complicated.

Assuming the player's configured for DHCP, and you've got a DHCP server (you probably do -- your router should do it), it should just work at that point.

If the player's not configured for DHCP, you'll need to connect over serial or USB to change the configuration.

For more information, start here: https://riocar.org/FAQ/6/248.html#248
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-- roger