Golang UDP Server只接收本地发送的数据包 [英] Golang UDP Server only recieving locally sent packets

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问题描述

我在Go上编写了一个UDP服务器(监听端口666),它似乎只接收本地发送的数据包。为了确认流量,我一直在使用:

  sudo tcpdump -n udp dst port 666 


  importnet

func startServer(){
//绑定端口。
ServerAddr,err:= net.ResolveUDPAddr(udp,localhost:666)
if err!= nil {
fmt.Println(Error binding port!)


ServerConn,_:= net.ListenUDP(udp,ServerAddr)
defer ServerConn.Close()

buf:= make([ ]字节,1024)
用于{
//接收UDP数据包并将其解组为一个protobuf。
n,_,_:= ServerConn.ReadFromUDP(buf)
fmt.Println(Packet received!)
//用buf做东西。




$ b如果从服务器运行的机器上运行,我使用:

  echo -nfoo| nc -4u -w1 127.0.0.1 666 

然后服务器接收到该数据包,并打印该消息(并且tcpdump显示没有输出)。

但是,如果我从网络上的另一台计算机上运行以下命令:

  echo -nfoo| nc -4u -w1 192.168.1.134 666 

然后,tcpdump报告正在收到的数据包( 15:05:43.634604 IP 192.168.1.113.59832> 192.168.1.134.666:UDP,长度9 确认我获得了IP地址),Go服务器不响应。



有没有什么特别的事情可以让Go响应非本地请求?

解决

  ServerAddr,err: = net.ResolveUDPAddr(udp,:666)


I've written a UDP Server in Go(listens on port 666), and it seems to be only receiving packets that were sent locally. To confirm traffic, I have been using:

sudo tcpdump -n udp dst port 666

My(abbreviated) server code:

import "net"

func startServer() {
    // Bind the port.
    ServerAddr, err := net.ResolveUDPAddr("udp", "localhost:666")
    if err != nil {
        fmt.Println("Error binding port!")
    }

    ServerConn, _ := net.ListenUDP("udp", ServerAddr)
    defer ServerConn.Close()

    buf := make([]byte, 1024)
    for {
        // Recieve a UDP packet and unmarshal it into a protobuf.
        n, _, _ := ServerConn.ReadFromUDP(buf)
        fmt.Println("Packet received!")
        // Do stuff with buf.
    }
}

If, from the machine the server is running on, I use:

echo -n "foo" | nc -4u -w1 127.0.0.1 666

then the server receives that packet, and prints the message(and tcpdump shows no output).

However, if I run the following from another computer on the network:

echo -n "foo" | nc -4u -w1 192.168.1.134 666

Then, while tcpdump reports a packet being received (15:05:43.634604 IP 192.168.1.113.59832 > 192.168.1.134.666: UDP, length 9 confirming I got the IP address right), the Go server does not respond.

Is there something special I need to do to make Go respond to non-local requests?

解决方案

Just listen on any address, you're listening on localhost only.

ServerAddr, err := net.ResolveUDPAddr("udp", ":666")

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