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Trying to route multicast

Posted: Fri Nov 13, 2020 6:32 pm
by duckasylum

I have a UPnP media server on my workstation and I occasionally stream media to my DNLA capable Smart-TV. I used to have a flat network with one subnet and everything worked but as soon as I split the network I can't stream media to my Smart-TV anymore. My workstation is connected to a CRS305-1G-4S+IN which is connected to an ASUS RT-AC68U running DD-WRT. The Smart-TV is connected to the Asus router. I am 99% sure that the problem is that DLNA is multicast over and uses SSDP. I managed to install the RouterOS multicast package and I was hoping to get everything working with IGMP Proxy - but something is still broken. I am not sure if the problem is at CRS side or Asus side.

To make things even more complicated all non-local traffic from the Smart-TV is routed to a OpenVPN tunnel between the Asus router and a VPN provider For that I have a special ip rule and alternative routing table. The br0 device in the Asus router (the physical port to which the Smart-TV connects is add to this bridge) has IGMP snooping on.

I tried playing with the IGMP-Proxy but I have no idea which interface should be marked upstream and even if IGMP proxy could help me in this scenario. Do I have to configure anything on the Asus router also?

I am attaching my home network schematic. The Smart-TV is and my workstation is

Re: Trying to route multicast

Posted: Sat Nov 21, 2020 10:51 am
by zerobase
What you probably need is an mDNS reflector.

Open-WRT supports this, not sure if DD-WRT does also.

More on mDNS: