用Python接收广播数据包 [英] Receiving Broadcast Packets in Python

问题描述

我有以下代码，它发送在子网中广播的 udp 数据包。

I have the following code which sends a udp packet that is broadcasted in the subnet.

from socket import *
s=socket(AF_INET, SOCK_DGRAM)
s.setsockopt(SOL_SOCKET, SO_BROADCAST, 1)
s.sendto('this is testing',('255.255.255.255',12345))

以下代码用于接收广播数据包。 / p>

The following code is for receiving the broadcast packet.

from socket import *
s=socket(AF_INET, SOCK_DGRAM)
s.bind(('172.30.102.141',12345))
m=s.recvfrom(1024)
print m[0]

问题在于它未接收到任何广播数据包。但是，它成功接收了发送到该端口的普通udp数据包。

The problem is that its not receiving any broadcast packet. However, it is successfully receiving normal udp packets sent to that port.

我的机器显然正在接收广播数据包，我使用 netcat 测试了该数据包。

My machine was obviously receiving the broadcast packet, which I tested using netcat.

$ netcat -lu -p 12345                                             
this is testing^C

那么，问题出在哪里？

So, where exactly is the problem?

推荐答案

尝试绑定到默认地址：

s.bind(('',12345))

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