Multicast routing, what do I need to do?

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Have a look here.

Multicast across subnets - smcroute

Got it working! Used these smcroutes in smcroute.conf: mgroup from br-iot group 239.255.255.250 mgroup from br-lan group 239.255.255.250 mroute from br-iot group 239.255.255.250 to br-lan mroute from br-lan group 239.255.255.250 to br-iot and these custom firewall rules for TTL: iptables -t mangle -A PREROUTING -i br-lan -d 239.255.255.250 -j TTL --ttl-inc 1 iptables -t mangle -A PREROUTING -i br-iot -d 239.255.255.250 -j TTL --ttl-inc 1 iptables -t mangle -A PREROUTING -i br-lan -d 224.0.0.…