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I'm trying to develop a small multiplayer game and I've been reading a lot about how NAT makes P2P impossible. On the other hand I've read a lot of server code which looks something like:

https://docs.python.org/3/library/asyncio-protocol.html#udp-echo-server

def datagram_received(self, data, addr):
    message = data.decode()
    print('Received %r from %s' % (message, addr))
    print('Send %r to %s' % (message, addr))
    self.transport.sendto(data, addr)

In the above code the server talks to the client using only plain IP address. Similarly this stackoverflow question

So what am I missing here - is there another way to write UDP send calls or does having them sit on a server auto-magically solves NAT?

stuartd
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Fantomas
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1 Answers1

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The crucial part is this one: client.Connect(ep);. The client is the one opening the connection to the server. If a connection is established, the client's router knows where to route incoming packets over the public port.

Having just a server does not circumvent the NAT problem. The same issues as with P2P would exists.

Maurice
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