C#UDP服务器多个实例ipv6同一端口 [英] C# UDP server multiple instances ipv6 same port

问题描述

我需要多个UDP服务器，使用来自.net的UDPClient类. 对于IPv4，我可以执行以下操作:

var udpServer1 = new UdpClient(new IPEndPoint(IPAddress.Parse("127.0.0.1"), 53));
var udpServer2 = new UdpClient(new IPEndPoint(IPAddress.Parse("127.0.0.2"), 53));
var udpServer3 = new UdpClient(new IPEndPoint(IPAddress.Parse("127.0.0.3"), 53));

它有效，我可以在端口53上侦听所有3个地址. 我需要对IPv6做同样的事情.但似乎我只能在1个环回地址":: 1"上收听.

如果我尝试使用":: 2"，则会收到请求的地址在其上下文中无效"错误.任何帮助将不胜感激.

谢谢！

解决方案

因此，经过更多调查后，我发现IPv6确实只有1个环回地址:":: 1".

但是！有一个叫做本地链接"的小东西，它以"fe80:..."开头，并且每个网络适配器都有一个唯一的地址，代表该特定网络适配器的回送地址. /p>

因此，我可以在:: 1端口53上打开一台服务器，或者我可以打开多台服务器，每个服务器都有一个.

I need multiple UDP servers, using the UDPClient class from .net. For IPv4 i can achieve this by doing the following:

var udpServer1 = new UdpClient(new IPEndPoint(IPAddress.Parse("127.0.0.1"), 53));
var udpServer2 = new UdpClient(new IPEndPoint(IPAddress.Parse("127.0.0.2"), 53));
var udpServer3 = new UdpClient(new IPEndPoint(IPAddress.Parse("127.0.0.3"), 53));

And it works, i can listen on all 3 addresses on port 53. I need to do the same for IPv6. But it seems that i can listen on only 1 loopback address "::1".

If i try to use "::2" i get a "The requested address is not valid in its context" error. Any help would be appreciated.

Thanks!

解决方案

So, after some more investigation i found out that indeed, IPv6 has only 1 loopback address: "::1".

BUT! There is a little thing called a "link-local" address, that starts with "fe80:..." and you have 1 of those unique to each of your network adapters, that represents the loopback address for that specific network adapter.

So, i can open a server on ::1 port 53, or i can open multiple servers, one for each of the network adapters i do have.

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