I have an device running openWRT. It is configured with a number of LAN ports, and one WAN port. A VPN has been configured over the WAN interface, and the WAN interface itself runs over a cellular link.
The LAN contains a multicast video source. To preserve cellular bandwidth, I am looking into whether it is possible to only stream multicast traffic over the cellular WAN link when we have at least one multicast listener on the remote network. I was looking into whether I could do this with IGMP snooping, but suspect PIM might be needed on the openWRT device itself....?
Can anyone shed any light here? I'm finding multicast to be a bit of a black art....is there a solution?