Multicast routing to Wireguard

[troglobit]

Multicast routing to Wireguard

[troglobit]

Hi,

I'm taking my first stumbling steps with Wireguard myself, so it's nice to hear back from users trying it out with mrouted as well! :)

From what I gather you seem to be able to run Wireguard in many different setups. My VPN provider give me a routed point-to-point L3 link. The interface in Linux has the following flags: POINTOPOINT,NOARP,UP,LOWER_UP

From those flags I can tell you mrouted will automatically filter out the wireguard interface, because the MULTICAST flag is not set. Also, for this to work, besides that missing flag, you'd need to have another mrouted instance running on the other side of the tunnel.

For things to work, you have to set up tunnels between multicast capable islands. In the early beginnings this was done with IP-IP tunnels, which mrouted has built-in support for (as long as you have the kernel module loaded), but today most people use GRE tunnels to connect routing domains. I.e., you can run Wireguard in whatever mode you like, as long as you then have a GRE tunnel on top of that and use the greN interface in your mrouted .conf. If you set up GRE, remember to check that the MULTICAST flag is set.

[troglobit]

Closing, no reply within a reasonable time frame.