IGMP Version

    The IGMP version could be defined in the /etc/sysctl.conf file. For example setup IGMPv2 for eth1 interface:
    net.ipv4.conf.eth1.force_igmp_version=2

    To apply changes restart system or launch:

    sysctl -p
    

    You can verify IGMP version with tcpdump. Launch:

    tcpdump -i eth1 igmp
    

    Then try to subscribe to the multicast stream. For example:
    astra --analyze udp://eth1@239.255.1.1:1234