I am trying to implement a peer to peer communication ..
I use sockets for communication between them. I want to know if there are any ways i can use the same sort of communication when the two peers are behind two private Networks (They dont know each others public ip address.) I can think of a shared buffer in a well known location as a means of communication. But is there some other way to get this done?
You may also have to consider the case where two peers don t even have public IP addresses, in which case you could use STUN techniques to avoid the need for a central server. STUN has been used effectively in products such as Skype (I think), but it remains quite a black art at this stage.
For a central approach, consider XMPP, of which ejabberd is a very popular implementation. Various other messaging protocols exist as well, such as the emerging AMPQ standard.
These technologies are likely to be more robust and scalable than a home-grown socket-based protocol.
STUN and TURN are the common ways to achieve this as already posted and are standards based approaches. However, I have seen a really interesting approach to doing this using icmp messages recently. It s called pwnat, and available here
Since both are in different private networks, both peers cannot communicate with each other. You need to have a public server in place, so that you can establish connection via that server. Refer resiprocate , Resiprocate for details
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