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commit c7592a83369c97e8d60b0295a82c18eeba7750f8 Author: Linus L��ssing linus.luessing@c0d3.blue Date: Sun Oct 31 23:58:36 2021 +0000
doc: batman-adv/Multicast-optimizations-tech
c7592a83369c97e8d60b0295a82c18eeba7750f8 batman-adv/Multicast-optimizations-tech.textile | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-)
diff --git a/batman-adv/Multicast-optimizations-tech.textile b/batman-adv/Multicast-optimizations-tech.textile index 4d41a50a..7c2664a2 100644 --- a/batman-adv/Multicast-optimizations-tech.textile +++ b/batman-adv/Multicast-optimizations-tech.textile @@ -95,9 +95,7 @@ For details on IPv4 and IPv6 multicast address ranges check out this detailed ar
h3. Routable multicast addresses
-For routable multicast addresses, further consideration has to be given: The according multicast packets not only need to be forwarded to any multicast listener on the local link, but to any multicast router, too. Otherwise off-link listeners, which are only reachable via a layer 3 multicast router, would not receive these multicast packets anymore. - -batman-adv currently detects IPv6 multicast routers by searching for ff02::2 all-routers multicast listeners (which overestimates by including unicast routers, too). For proper IPv4+IPv6 multicast router detection "Multicast Router Discovery":https://tools.ietf.org/search/rfc4286 needs to be implemented in batman-adv (implemented in the bridge, tapping into this is still ToDo). +For routable multicast addresses, further consideration has to be given: The according multicast packets not only need to be forwarded to any multicast listener on the local link, but to any multicast router, too. Otherwise off-link listeners, which are only reachable via a layer 3 multicast router, would not receive these multicast packets anymore. batman-adv detects node local multicast routers through _/proc/sys/net/<ipv4|ipv6>/conf/<iface>/mc_forwarding_ and uses a bridge's "Multicast Router Discovery":https://tools.ietf.org/search/rfc4286 capabilities for bridged-in hosts.
h2. Limitations