Question

Even if UDP is connection-less, I would like to establish some kind of connection between a client and a server. The thing is, once the server has received something from the client, the only thing I can do send my answer is use the IP and the Port from the client.

And well... this will, in almost EVERY CASE, not be the IP of the client, because the client doesn t have an IP on the Internet : only its router does. I would like to know how to send back data to the client, even if he s behind a router.

I m开始相信它是不可能的......但是,可以做到吗? 不要说我的视频集束只用用户向服务器发送数据。

Answer 1

仅仅通过同样的袖珍向客户寄回,国家信托局将自动解决该问题,并将它传给实际的箱子。

Answer 2

Options for UDP behind firewalls:

Explicit rules on the firewall/NAT forwarding UDP packets to a particular machine.
UPnP to setup the rules automatically (from the client end)
Automatic return path for UDP - NAT remembers ports and IP addresses, and creates a return rule for UDP packets.

Answer 3

你的路由人将注意到,它重新编制了一个即将卸任的数据包,以看它是否来自航线上的一个港口,并记住这一点。如果随后向同一港口接收了UDP的包裹地址,那么我会说“Oh,我知道什么地方会把这一地址发送到网络内原始数据所得出的港口。

通常,航道者会记得一段时期的路线,如果在港口看到任何东西,就会忘记这些路线。

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