问题描述
请帮助我解决我的问题。一方面，我将IP 172.27.13.2的服务器连接到路由器172.27.13.1的WAN接口...然后在路由器192.168.1.1的无线LAN上，我连接了一些客户端。现在，我将用C编写代码，其中客户端从服务器请求一些UDP流，然后服务器向客户端广播流，如果某些数据包丢失，客户端必须向服务器发送NACK。我的问题是：
因为服务器和客户端位于不同的子网上，如何从服务器广播？
客户端如何将请求和NACK发送到服务器，因为它们位于不同的子网中？
这些问题可以通过路由器配置还是用C代码解决？
Please if you can help me about my problem. On one side I have server with IP 172.27.13.2 connected to the WAN interface of router 172.27.13.1 ...Then on wireless LAN of my router 192.168.1.1 I have connected a few clients. Now I will write code in C where client are requesting some UDP streams from server, then server broadcasts streams to clients, and if some packets get lost clients must send NACK to server. My questions is:Because server and clients are on different subnets how can I broadcast from server?And how the client can send request and NACKs to server because they are in different subnets?Are these problems can be solved by router configurations or in C code?
感谢您的帮助
推荐答案
您不能广播到其他子网。路由器通常不会将广播数据包转发到不同的子网，除非您具有可以正确配置的非常特殊的路由器（例如Cisco ...）。但是，您可以将多播用于此类任务。这是
You cannot broadcast to different subnets. Routers do not usually forward broadcast packets to different subnets, unless you have a very special router that can be configured properly (e.g. Cisco ...). You could however use multicast for such a task. Here's a C example
也检查以下内容：
注意：c示例中的某些包含项丢失了，但是很容易找到
NOTE: some includes in the c example are missing, but they are easy to find
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