Python在所有接口上发送UDP广播

Question

您好我有两个接口eth0（192.168.1.115）和wlan0（192.168.0.1）。我想发送一个广播。这是我的代码。但它只在eth0发送广播，我不知道为什么？

import socket
import time
import json
import threading

class BroadCaster(object):

    def __init__(self, MESSAGE):
        super(BroadCaster, self).__init__()
        self.MESSAGE = json.dumps(MESSAGE)
        self.UDP_IP = '<broadcast>' 
        self.UDP_PORT = PUERTO_DIFUSION
        self.sock1 = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
        self.sock1.bind(('',0))
        self.sock1.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1)
        self.sock1.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)

        self.sock2 = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
        self.sock2.bind(('192.168.0.1',0))
        self.sock2.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1)
        self.sock2.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)


    def run(self):
        def broadcast(self):
            while True:
                print '* * Enviando * *'
                self.sock1.sendto(self.MESSAGE, (self.UDP_IP, self.UDP_PORT))
                self.sock2.sendto(self.MESSAGE, ('192.168.0.255', self.UDP_PORT))
                time.sleep( TIEMPO_ANUNCIOS )
        # manejo de hilos
        thread = threading.Thread(target=broadcast(self))
        thread.setDaemon(True)
        thread.start()

data = {'Nombre': OBJETO_PYRO, 'IP': DIRECCION_WS+':'+str(PUERTO_WS), 'IP_2':DIRECCION_BLUETOOTH ,'Mensaje': MENSAJE}
caster = BroadCaster(data)
caster.run()

我无法通过tcpdump看到广播（我认为它不会发送任何内容），但如果我把

self.sock2.sendto(self.MESSAGE, ('192.168.0.2', self.UDP_PORT))

它有效，'192.168.0.2'是它试图看到广播的另一台电脑。