两个任意源之间的文件/数据传输
我正在寻找一种简单的方法来实现这种情况：
假设我有两台机器，我想在它们之间共享数据。这些机器的位置/地址可以随时更改。我希望两台机器都能签入中央服务器以宣布它们的可用性。两个系统之一想要从另一个系统中提取文件。我知道我可以让接收器系统向服务器发出请求，然后服务器从源请求文件，拉出它，然后将其提供给请求者。然而，从带宽的角度来看，这似乎效率低下。文件将被传输两次。是否有一个系统可以让源将其直接广播到接收器？
如果系统位于防火墙后面，则无法保证诸如端口转发之类的事情。我不知道有什么办法。
谢谢。
I'm looking for a simple way to implement this scenario:
Say I have two machines I'd like to share data between. The location/addresses of these machines can change at any time. I'd like both machines to check in to a central server to announce their availability. One of the two systems wants to pull a file from the other. I know that I can have the sink system make a request to the server, who then requests the file from the source, pulls it, then feeds it to the requester. However, this seems inefficient from a bandwidth perspective. The file will be transfered twice. Is there a system in place where the source can broadcast it directly to the sink?
Without being able to guarantee things like port forwarding if a system is behind a firewall etc. I don't know of a way.
Thanks.
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当机器
A想要向机器B发送数据时，A向中央服务器C发送请求。C向B请求许可。如果接受，C会将B的 IP 和端口提供给A。A尝试直接连接到B。如果不成功（即，如果B位于路由器/防火墙后面），则A会通知C失败。然后，C将A的IP 和端口提供给B。B尝试直接连接到A（应该能够通过B的防火墙/路由器）。如果任一连接成功，则A具有直接连接以将数据发送到B。如果两个连接均不成功（即，如果A也位于防火墙/路由器后面），则C必须充当A< 之间所有传输的代理。 /code> 和B。When machine
Awants to send data to machineB,Asends a request to the central serverC.CasksBfor permission. If accepted,CgivesB's IP and port toA.Aattempts to connect toBdirectly. If unsuccessful (ie, ifBis behind a router/firewall), thenAnotifiesCof the failure.Cthen givesA's IP and port toB.Battempts to connect directly toA(which should be able to pass throughB's firewall/router). If either connection is successful, thenAhas a direct connection to send data toB. If both connections are unsuccessful (ie, ifAis also behind a firewall/router), thenChas to act as a proxy for all transfers betweenAandB.