On Thu, 07 Jul 2005 18:37:07 +0200 Olaf Menzel <olaf.menzel@xxxxxxxxxxxxxxxxxxx> wrote: > Hello, > > I am experimenting with delivering IPv6 multicast traffic over the > WRT54GS, running OpenWRT. OpenWrt is currently running linux-2.4.30 for > the mipsel architecture and the OpenWRT distribution has bridged the 4 > port LAN switch (vlan0) with the WLAN interface (eth1) by default. On > the IP layer both devices are represented via the br0 interface. The > bridge work fine for IPv4 Unicast and Multicast and for IPv6 Unicast but > not for IPv6 multicast. > > I went into a problem with forwarding the MLDv2_report message over the > bridge from a mobile client, connected over WLAN. The MLDv2 report > messages are received in in the eth1 (WLAN IF), but not in the eth0 nore > in the br0 interface. Does the bridge support IPv6 multicast compliant > MAC addresses, starting with 3333+LowByte(Ipv6 MulticastAddress) ? The bridge handles IEEE multicast mac addresses (ie. least significant bit of first byte of address is set). What is a an example Ethernet MAC address of a MLDv2 message? > Usually a bridge is working on L2 and should forward any ICMPv6 packages > .? The bridge is forwarding any other IPv6 traffic without problems > e.g. ICMPv6 messages generated with ping6. MLDv2 report messages are a > subset of IPv6 ICMP messages with the link local IPv6 multicast address > FF02::16 ( all MLDv2 compliant router) as destination address. The same > behavior I figured out with the MLDv2 query messages, sent by the > Multicast router to all nodes (FF02::1) on the local link. The MLD query > I have seen at the eth0 IF but not at the wireless link. Any other IPv6 > link local multicast adresses are forwarded e.g. IPv6 router > advertisements or neighbour soicitation messages. Do you have any idea, > how to solve the problem ?? The bridge intentionally knows nothing about higher level protocols. But if you are using ebtables/iptables perhaps a filtering rule is getting in the way.
