Sometimes, icmpv6 neighbor advertisement packets are being sent out of the hypervisor without their VLAN tag. It seems to only happens when the icmpv6 is sent to a multicast address. That doesn't happen to every VMs, and not all the time. Can't reproduce the problem on demand yet.
I'm trying to better understand what the log message "skipping output to input port" really means. Because every time a packet is sent without a VLAN tag, we also see this printed in the log. Normally, these packets are being VLAN tagged, and when we ofproto/trace, we see that the packet should be tagged. 2019-11-12T21:06:13.838Z|01842|ofproto_dpif_xlate(handler148)|INFO|skipping output to input port on bridge br0 while processing recirc_id=0x5a4de60,ct_state=inv|trk,eth,icmp6,in_port=10227,vlan_tci=0x0000,dl_src=6a:5e:dd:34:f9:be,dl_dst=33:33:ff:25:80:0b,ipv6_src=fe80::685e:ddff:fe34:f9be,ipv6_dst=ff02::1:ff25:800b,ipv6_label=0x00000,nw_tos=0,nw_ecn=0,nw_ttl=255,icmp_type=135,icmp_code=0,nd_target=2604:xxxx:x:xx::xx:xxxx,nd_sll=6a:5e:dd:34:f9:be,nd_tll=00:00:00:00:00:00 I read https://github.com/openvswitch/ovs/blob/master/ofproto/ofproto-dpif-xlate.c but yet I'm not sure I fully grasp what it means. Also, since it's intermittent, seems like there is something dynamic. Looked at the connection tracking, and also at the ovs/show/route cache... but haven't figured yet. thanks !
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