I read about allowing traffic to or from 224.0.0.0/4 (can't remember) in the firewall section to make multicast routable across different subnets, but I'm not sure how it's done.
The two subnets in question are LAN1 (192.168.1.0/24) and LAN2 (192.168.10.0/24), which reside in the same firewall zone, how do I set in the firewall section to allow devices in either subnet to discover services in the other? Thank you.
From my test, even without the TTL hack, I can discover DLNA across subnets, and now with the help of it, I'm still not seeing chromecast targets on the other side, do you have experiences with the chromecast "issue"?
I don't have experience with Chromecast, but as with any problem, you'll have to troubleshoot it.
First of all verify that the rules you added have some hits (`iptables-save -c | grep TTL)
Verify with tcpdump that the packets received are relayed to the other interface.