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