I have got a multicast packet capture I'm playing with tcpreplay:
sysctl net.ipv4.conf.all.rp_filter=0
sysctl net.ipv4.conf.eth0.rp_filter=0
tcpreplay -i eth0 --loop=100 new.pcap
I watch the traffic on eth0 with wireshark and I can see the packets I'm interested in (let's say 224.0.23.60:4937).
But the following python app cannot find the packets:
import socket
import struct
MCAST_GRP = '224.0.23.60'
MCAST_PORT = 4937
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDP)
sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
sock.bind((MCAST_GRP, MCAST_PORT)) # use MCAST_GRP instead of '' to listen only
# to MCAST_GRP, not all groups on MCAST_PORT
mreq = struct.pack("4sl", socket.inet_aton(MCAST_GRP), socket.INADDR_ANY)
sock.setsockopt(socket.IPPROTO_IP, socket.IP_ADD_MEMBERSHIP, mreq)
while True:
print '#'
print sock.recv(64)
netstat -g is giving the following output:
lo 1 all-systems.mcast.net
eth0 1 224.0.23.60
Am I missing something here ?
[Edit] I should precise that the ip src in my packet capture is not in the same network subdomain (ip src: 192.168.1.10) whereas my ip is something like 146.186.197.164.
