Yaiy, it works! The full integration test for a #multicast audio stream at #Freifunk involving #Gluon, #batman_adv, @gstreamer and #brmldproxy + #pim6sd + #EmbeddedRP with routing between @ffhl and a test domain at @Freifunk Vogtland was successful (at least with pim6sd in #MLDv1 mode).
Next need to do a few, small updates to my brmldproxy integration pull-requests for Gluon. And need to look into the #MLDv2 mode issues with #pim6sd. And need to document some more stuff.
@troglobit also in #ICMPv6 RA / #RFC4861 it seems that again only a prefix plus prefix length is allowed. And not a netmask. Which would seem quite useful for #IPv6 #multicast?
And now I'm also wondering if a host's #IPv6 stack receiving any (routeable) unicast prefix via #SLAAC or #DHCPv6 should maybe just install the matching #embeddedRP #multicast prefix on its own, by default on the according interface?