On Mon, Sep 05, 2022 at 03:23:21PM +0200, Sebastien Marie wrote: > 15:06:59.567147 c8:be:19:e2:2c:ed 33:33:ff:fc:bf:56 ip6 86: > fd00:65c6:f26a:5c::1 > ff02::1:fffc:bf56: icmp6: neighbor sol: who has > fd00:65c6:f26a:5c:452e:64ab:3ffc:bf56
Some packets sent by the neighbor solicitation state machine go to multicast MAC address destination. who has fd00:65c6:f26a:5c:452e:64ab:3ffc:bf56 all matching hosts ff02::1:fffc:bf56 multicast MAC 33:33:ff:fc:bf:56 The have all the same suffix. Idea is to reduce broadcasts within the IP stack by filtering the correct multicast MACs in the network hardware. If this packet is not received during normal operation but with tcpdump promiscuous mode, this meas that the multicast filter in the network card is not set correctly. I suspect an em(4) driver bug. bluhm
