Multicast Routing (layer 3)
Multicast applications are often not that interesting with only a few listeners. The strength of multicast over unicast unfolds the more multicast listeners participate. On the other hand multicast applications are still niche, leading to a chicken and egg problem.
One way to address this issue could be to make sure multicast packets in one Freifunk Gluon domain can reach any other domain or even other Freifunk community. A protocol which can achieve this is PIM, Protocol Independent Multicast. The following describes the setup of how this was achieved in a test between Freifunk Lübeck (currently uses a 200 nodes single domain setup) and a domain at Freifunk Vogtland via pim6sd.
