Network communication over two private networks
I am trying to implement peer-to-peer communication.
I am using sockets to communicate between them. I want to know if there are any ways that I can use the same message when the two peers are behind two private networks (they don't know each other's public IP.) I can think of a shared buffer in good known place, means of communication. But is there any other way to do this?
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You may also need to consider the case where the two peers don't even have public IP addresses, in which case you can use STUN to avoid the need for a central server. STUN is used effectively in products like Skype (I think), but at this stage it remains pretty black.
For a central approach, consider XMPP , of which ejabberd is a very popular implementation. There are other messaging protocols like the new AMPQ standard.
These technologies are likely to be more reliable and scalable than the home socket-based protocol.
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STUN and TURN are the usual ways to achieve this, as already posted, and are standards based. However, I have seen a very interesting approach to this using icmp posts recently. It's called pwnat and is available here
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Since both are on different private networks, both peers cannot communicate with each other. You need to have a public server in order for you to establish a connection through that server. For more information see Resiprocate, Resiprocate
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