IPv4 and IPv6 multicast

ipv4-udp-client.py

#!/usr/bin/env python3

import socket

GROUP = '224.1.1.1'
HOST = '0.0.0.0'
PORT = 5000

def main():
    sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDP)
    sock.bind((GROUP, PORT))
    sock.setsockopt(socket.SOL_IP, socket.IP_ADD_MEMBERSHIP, socket.inet_aton(GROUP) + socket.inet_aton(HOST))

    while True:
        data, addr = sock.recvfrom(1024)
        print(addr, data)

if __name__ == '__main__':
    main()

ipv4-udp-server.py

#!/usr/bin/env python3

import socket

from time import sleep

GROUP = '224.1.1.1'
PORT = 5000

def main():
    sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDP)

    index = 0

    while True:
        msg = b'message %d' % index
        print(msg)
        sock.sendto(msg, (GROUP, PORT))
        index += 1
        sleep(1)

if __name__ == '__main__':
    main()

ipv6-udp-client.py

#!/usr/bin/env python3

import socket
import struct

GROUP = 'ff05::1:1000'
PORT = 5000

def main():
    sock = socket.socket(socket.AF_INET6, socket.SOCK_DGRAM, socket.IPPROTO_UDP)
    sock.bind((GROUP, PORT))
    sock.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_JOIN_GROUP, struct.pack('16si', socket.inet_pton(socket.AF_INET6, GROUP), 0))

    while True:
        data, addr = sock.recvfrom(1024)
        print(addr, data)

if __name__ == '__main__':
    main()

ipv6-udp-server.py

#!/usr/bin/env python3

import socket

from time import sleep

GROUP = 'ff05::1:1000'
PORT = 5000

def main():
    sock = socket.socket(socket.AF_INET6, socket.SOCK_DGRAM, socket.IPPROTO_UDP)

    index = 0

    while True:
        msg = b'message %d' % index
        print(msg)
        sock.sendto(msg, (GROUP, PORT))
        index += 1
        sleep(1)

if __name__ == '__main__':
    main()

https://www.altlinux.org/Static_Multicast_Routing