Most ISPs (at least here) provide you with 2 IPs. So if you connect your PC and PS2 to an unswitched hub each device would get an it's own external IP you could capture the PS2's packets as they broadcast trhough the hub.
*edit*
Or if you only get one IP and use a router to connect more than one thing to the net. Connect the hub to the router and your devices to the hub and you will be able to sniff the packets after that have been NATed to the internal IPs.
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