SuperNodes are always on routable open IP addresses. His answer was, "Without being too technical, each Skype client is always connected to a SuperNode (any Skype client can become a SuperNode, the SuperNode is acting as a hub). We asked him how does Skype manage to route the call to the appropriate PC without special configuration being done on the router, and a Skype software router in place on the LAN to process the incoming data and route it to the relevant PC?
Readers were concerned that the peer to peer networking guru had found a way to creep in the back door, managing to open a port from outside and wanting re-assurance that he hadn't.
If, like some of our readers, you are either confused about how the new Skype Voice over IP system gets past firewalls and NAT routers, or you are skeptical about it, it's worth noting the answer that Niklas Zennstrom, one of the key architects of both Kazaa and Skype gave us on the subject.
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