@ccnewmeraki wrote: Well, SSM is just a term for IGMPv3 over IPv4, or MLDv2 over IPv6. With IGMPv3 the router and end OS all have to take part in the multicast group, so it's router and OS dependent. ASM (the older, more usual form of multicast) uses IGMPv2 or MLDv1. It sounds like the problem is that IGMPv3 isn't implemented on some of the non-ISP provided routers you have tried. I can't find any info claiming that the MX range does implement this, so it's likely this is the case. https://documentation.meraki.com/zGeneral_Administration/Other_Topics/Multicast_support#IGMP_Support_on_the_Cisco_Meraki_Security_Appliance "MX Security Appliances will forward IGMP traffic for a single broadcast domain. It does not forward multicast traffic upstream, between VLANs, or over a VPN." This sounds to me to be talking about the older ASM IGMP versions, not IGMPv3 / SSM. I'd still suggest trying the ISP-provided router (which will implement IGMPv3 for your network) for the NAT, and use the MX in bridge-mode (which as long as it doesn't have a firewall rule in place shouldn't block the traffic). You don't lose any MX advanced security features in passthrough-mode, it will still provide client tracking, AMP, IDS, AV, and firewall capability to your devices. Hi There is more to it, than you are suggesting. Meraki claims to be able to support multicast, including SSM, on the MX. But when I lodged a support case they came back stating that it is not supported as the TV broadcasters are using it - which is a specific IEEE standard, that many US suppliers do not implement, for whatever reason. I only use modems that are certified BT compliant. The MS is IGMPv3 compliant, the MX is not, in this context. To quote Meraki - Cisco Meraki security appliances can pass IPv6 traffic in pass-through mode, but no traffic analysis or manipulation is possible when using IPv6. The irony is that Meraki employs as an engineer the person who developed how this form of SSM was to operate whilst previously employed by BT. So they know how to do it, but when they get round to it, who knows. Korean, Japanese and Taiwanese manufacturers know how to make this work, but then they have very advanced networks, beyond steam punk.
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