On Aug 21, 2011, at 10:32 PM, Bing Li wrote:
> According to your email, P2P is not available on 3G?
A device can’t receive an incoming TCP connection over 3G. That’s part of the way the carriers run IP over their cell networks, not anything mandated by Apple.
(All the incoming signaling handled by iOS, like phone calls, SMS, and app notifications, runs directly over GSM without using IP. 3rd party apps definitely don’t have access to that low-level functionality; the carriers are pretty nervous about unauthorized use of it.)
> If so, P2P based applications cannot be launched in AppStore?
No, it doesn’t rule out P2P, it’s just that the device will have to be the one making the connection.
For example, it’s possible to run a BitTorrent node without accepting incoming connections; in practice, the other nodes will think you’re leeching and probably won’t send you much data, but that’s a matter of configuration, not part of the protocol. It all depends on how your protocol works.
> Without 3G's support, how can a P2P system run in a wireless environment?
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