Repository : ssh://git@open-mesh.org/doc

On branches: backup-redmine/2019-09-14,master

commit 6171414db606e11296abfa1fa1d43d84ce94d208 Author: Linus Lüssing linus.luessing@c0d3.blue Date: Thu Aug 1 19:59:28 2019 +0000

doc: batman-adv/Multicast-optimizations-tech

6171414db606e11296abfa1fa1d43d84ce94d208 batman-adv/Multicast-optimizations-tech.textile | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/batman-adv/Multicast-optimizations-tech.textile b/batman-adv/Multicast-optimizations-tech.textile index 61e03e9..9194e56 100644 --- a/batman-adv/Multicast-optimizations-tech.textile +++ b/batman-adv/Multicast-optimizations-tech.textile @@ -93,8 +93,9 @@ 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. To be on the safe side, batman-adv currently simply floods these address ranges. To support these address ranges later, too, "Multicast Router Discovery":https://tools.ietf.org/search/rfc4286 needs to be implemented in batman-adv (which was not done yet). +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).

h2. Limitations