On Thu, Jun 11, 2015 at 04:44:14PM +0200, Bjoern Franke wrote:
Hi Marek,
Do you have the multicast optimizations enabled ? 2014.3.0 still has a known bug causing these optimizations to harm multicast traffic. Either disable this feature or upgrade to something newer than 2014.3.0.
IThanks for your reply. Multicast optimizations are disabled, but we ha ve multicast related errors in the logs: br-mesh: Multicast hash table chain limit reached: bat0br-mesh: Cannot rehash multicast hash table, disabling snooping: bat0, 201, -22 Regardsbjo
There's a hash_max value for the bridge (/sys/class/net/<br>/bridge/hash_max). By default it's rather small, just 512 entries / multicast listeners, so it's expected that with 500 nodes the bridge multicast snooping will shut down.
Nevertheless, even if the bridge deactivates its multicast snooping that shouldn't cause trouble for ICMPv6.
Which firmware are you using, do you see ICMPv6 packets entering bat0 on the gateway and leaving bat0 on the router?
Cheers, Linus