Trying to setup multicast route to interface in Ubuntu 18.04.2 Netplan's syntax does not allow something like:
routes: - to: 224.0.0.0/4 dev: eno1 this config does not work:
addresses: - 192.160.0.1/24 routes: - to: 224.0.0.0/4 via: 192.168.0.1 how to set-up multicast route correctly?
On Ubuntu 20.04, If you only setup to: you would receive a warning saying:
Error in network definition: unicast route must include both a 'to' and 'via' IP It seems to assume that the route is a unicast route. However via is not necessary when adding a multicast route.
The correct configuration is:
ens224: addresses: - 192.160.0.1/24 routes: - to: 224.0.0.0/4 scope: link This will result in the following route to be added:
224.0.0.0/4 dev ens224 proto static scope link scope: is described at: http://manpages.ubuntu.com/manpages/focal/man5/netplan.5.html and more precisely at: http://manpages.ubuntu.com/manpages/focal/man8/ip-route.8.html
scope SCOPE_VAL the scope of the destinations covered by the route prefix. SCOPE_VAL may be a number or a string from the file /etc/iproute2/rt_scopes. If this parameter is omitted, ip assumes scope global for all gatewayed unicast routes, scope link for direct unicast and broadcast routes and scope host for local routes. The docs are not super clear indeed but we've had some luck with the following:
routes: - to: 224.0.0.0/4 via: 0.0.0.0 