After upgrading from EA6900-v1.0 to v1.1 (both with same SW=1.1.42.161129),
we observed that IPv4 multicast starts to fail (group membership expires).
Does anybody know about the internal architecture in these Routers (e.g. any unmanaged internal switches)?
It works fine if everything is wired.
However if host1 is connected to wired and host2 is connected to 2.4G wireless,
we see that Bonjour multicast gets forwarded but PTP multicast only in one direction.
We believe this could be related to a IGMP feature called "IGMP Report Suppression", where a host not will send "IGMP Report" (aka Join mcast group), if it receives an "IGMP Report" for the same group "recently". In that case it believes a peer within same hub already has subscribed.
Our theory is that in this mixed wired/wireless setup the Router might not forward PTP multicast traffic between wired and wireless when nobody send Report "on the other side".
However in that case we don't understand why it still seems to forward "IGMP Report" to "the other side"...
Bonjour uses 224.0.0.251 (within "Local Network Control Block") and PTP uses 224.0.1.129 (outside that block).
Routers might have different forwarding rules for these two ranges, see below.
http://www.iana.org/assignments/multicast-addresses/multicast-addresses.xhtml
"Local Network Control Block (224.0.0.0 - 224.0.0.255 (224.0.0/24))"
http://www.ietf.org/proceedings/50/I-D/idmr-snoop-00.txt
"It is suggested that all multicast packets in the range 224.0.0.1 through 224.0.0.255 are forwarded on all ports."
/Mads