I knew DHCP request from VM is not sent out of the host but I don't know
how to identify the root cause. as shown in my earliest log I can just find
the packet is output to the vxlan port
cookie=0x0, duration=2294.917s, table=0, n_packets=9, n_bytes=1434,
send_flow_rem in_port=2,dl_src=fa:16:3e:d6:ee:31
actions=set_field:0x3e9->tun_id,goto_table:10
...
cookie=0x0, duration=2262.715s, table=10, n_packets=4, n_bytes=784,
send_flow_rem
priority=16384,tun_id=0x3e9,dl_dst=01:00:00:00:00:00/01:00:00:00:00:00
actions=output:3,goto_table:20
port 3 is "vxlan-172.31.0.125"
Bridge br-int
Controller "tcp:172.22.11.43:6633"
is_connected: true
fail_mode: secure
Port "vxlan-172.31.0.125"
Interface "vxlan-172.31.0.125"
type: vxlan
options: {key=flow, local_ip="172.22.11.43",
remote_ip="172.31.0.125"}
is it right so far? if yes, why does openvswitch not send the packet out?
2014-05-23 1:43 GMT+08:00 Qin, Xiaohong <xiaohong....@emc.com>:
> If you don’t see DHCP traffics between VM and controller, VXLAN tunnel is
> not functioning yet. The tunnel is created between controller node and
> compute node, VM on compute node is not getting DHCP traffic from
> controller node, which means the tunnel is not passing any traffic yet.
>
>
>
> Dennis Qin
>
>
>
> *From:* discuss [mailto:discuss-boun...@openvswitch.org] *On Behalf Of *
> t22330033
> *Sent:* Wednesday, May 21, 2014 7:53 PM
>
> *To:* discuss@openvswitch.org
> *Subject:* Re: [ovs-discuss] network problem with vxlan
>
>
>
> 2014-05-22 10:20 GMT+08:00 t22330033 <t22330...@gmail.com>:
>
>
>
> 2014-05-21 0:25 GMT+08:00 Qin, Xiaohong <xiaohong....@emc.com>:
>
>
>
> Can you session into dhcp namespace to run tcpdump on that tap interface
> to see if the dhcp traffic is been exchanged between dns process and VM?
>
>
>
> tcpdump in the dhcp namespace captures nothing no matter I start an
> instance from nova controller or compute node. however the network of VM in
> controller node is OK but not OK in compute node.
>
>
>
>
>
> sorry, I think I made a mistake here. tcpdump did capture the DHCP packets
> when starting a VM from controller node. it was just shown extremely slow
> that I thought there's nothing. I'm sure that there're still no DHCP
> packets for VM started in compute node.
>
>
>
>
>
> another finding regarding the manually-created bridge that works for vxlan
> is that if I set the fail-mode to secure, it won't send vxlan packet
> anymore. I saw the setting on bridges created by neutron are all set to
> secure. it that the root cause?
>
>
>
>
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