On Tue, Apr 25, 2017 at 9:16 AM, Murali Karicheri <m-kariche...@ti.com> wrote: > On 04/18/2017 06:37 PM, Cong Wang wrote: >> Did you assign IPv4 and IPv6 addresses to the HSR master device? > > No. I just used IPv4. From the trace mld_ifc_timer_expire() -> mld_sendpack() > -> ip6_output() > do you know what is it trying to do? Is it some neighbor discovery message or > something > going over the lower interface instead of the hsr interface? >
IPv6 is special here because it has link-local address configured automatically for each device, so this mld_ifc_timer is armed for link-local multicasts. See: 464 /* Join interface-local all-node multicast group */ 465 ipv6_dev_mc_inc(dev, &in6addr_interfacelocal_allnodes); 466 467 /* Join all-node multicast group */ 468 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allnodes); 469 470 /* Join all-router multicast group if forwarding is set */ 471 if (ndev->cnf.forwarding && (dev->flags & IFF_MULTICAST)) 472 ipv6_dev_mc_inc(dev, &in6addr_linklocal_allrouters);
