如何为存在2个网卡的UDP组播设置套接字？

import socket
import struct

sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDP)

sock.bind(('<IP_ADDRESS_OF_NETWORK_CARD>', <PORT_NUMBER>))

sock.setsockopt(socket.IPPROTO_IP, socket.IP_MULTICAST_IF, socket.inet_aton('<IP_ADDRESS_OF_NETWORK_CARD>'))

sock.setsockopt(socket.IPPROTO_IP, socket.IP_ADD_MEMBERSHIP, socket.inet_aton('<MULTICAST_GROUP_IP>') + socket.inet_aton('<IP_ADDRESS_OF_NETWORK_CARD>'))

# Send data
sock.sendto(<DATA_TO_SEND>, ('<MULTICAST_GROUP_IP>', <PORT_NUMBER>))

# Receive data
data, addr = sock.recvfrom(<BUFFER_SIZE>)

sock.close()