[ovs-discuss] OVS drops icmpv6 packets for actions:NORMAL

[Ben Pfaff]

On Tue, Oct 15, 2019 at 07:22:11PM +0000, PATEL Harsh wrote:
> Hi,
> I have been using openvswitch version 2.8.2. And I haven't added any 
> flows to forward traffic. Just the default one that is as followed. With 
> this flow seems like my bridge BR_LAN drops incoming icmpv6 traffice 
> from LAN client. There is also detailed flow as follows in that it says 
> datapath actions: drop. I don't know why this is happening can you 
> please help me with that?
> 
>   ovs-ofctl dump-flows BR_LAN
>   cookie=0x0, duration=7210.426s, table=0, n_packets=117886, 
> n_bytes=85217235, priority=0 actions=NORMAL
> 
> 
> Detailed flow for LAN client:
> 
> ovs-appctl ofproto/trace BR_LAN dl_src=00:00:00:04:eb:d0,dl_dst=
> 33:33:00:00:00:fb,dl_type=0x86dd
> Flow: 
> ipv6,in_port=ANY,vlan_tci=0x0000,dl_src=00:00:00:04:eb:d0,dl_dst=33:33:00:00:00:fb,ipv6_src=::,ipv6_dst=::,ipv6_label=0x00000,nw_proto=0,nw_tos=0,nw_ecn=0,nw_ttl=0
> 
> bridge("BR_LAN")
> ----------------
>   0. priority 0
>      NORMAL
> 
> Final flow: unchanged
> Megaflow: 
> recirc_id=0,eth,ipv6,in_port=ANY,vlan_tci=0x0000/0x1fff,dl_src=00:00:00:04:eb:d0,dl_dst=33:33:00:00:00:fb,ipv6_dst=::,nw_proto=0,nw_frag=no
> Datapath actions: drop

With recent OVS, I'm not seeing this problem:

    [bpfaff at sigfpe tutorial]$ ovs-vsctl add-br BR_LAN
    [bpfaff at sigfpe tutorial]$ ovs-vsctl add-port BR_LAN p0
    [bpfaff at sigfpe tutorial]$ ovs-vsctl add-port BR_LAN p1
    [bpfaff at sigfpe tutorial]$ ovs-vsctl add-port BR_LAN p2
    [bpfaff at sigfpe tutorial]$ ovs-appctl ofproto/trace BR_LAN dl_src=00:00:00:04:eb:d0,dl_dst=33:33:00:00:00:fb,dl_type=0x86dd
    Flow: ipv6,in_port=ANY,vlan_tci=0x0000,dl_src=00:00:00:04:eb:d0,dl_dst=33:33:00:00:00:fb,ipv6_src=::,ipv6_dst=::,ipv6_label=0x00000,nw_proto=0,nw_tos=0,nw_ecn=0,nw_ttl=0

    bridge("BR_LAN")
    ----------------
     0. priority 0
        NORMAL
         -> no learned MAC for destination, flooding

    Final flow: unchanged
    Megaflow: recirc_id=0,eth,ipv6,in_port=ANY,dl_src=00:00:00:04:eb:d0,dl_dst=33:33:00:00:00:fb,nw_frag=no
    Datapath actions: 1,2,3,4
    [bpfaff at sigfpe tutorial]$ 

I also don't see the problem when I go back to the latest 2.8.x.

I wonder what's different about your setup.