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?
Dennis From: discuss [mailto:discuss-boun...@openvswitch.org] On Behalf Of t22330033 Sent: Tuesday, May 20, 2014 12:20 AM To: discuss@openvswitch.org Subject: Re: [ovs-discuss] network problem with vxlan 2014-05-19 23:58 GMT+08:00 Qin, Xiaohong <xiaohong....@emc.com<mailto:xiaohong....@emc.com>>: You have to start with the dhcp problem first in your case. “ip netns” on your controller node should list a dhcp name space, ip netns qdhcp-3fc234e5-335f-463d-ba1d-bcf1bdd8f479 qrouter-6df76d30-17fc-4024-8d01-4cfe007ab531 then session into that dhcp name space, sudo ip netns exec qdhcp-3fc234e5-335f-463d-ba1d-bcf1bdd8f479 ifconfig it should list a tap interface, tapef85f5c3-c5 Link encap:Ethernet HWaddr fa:16:3e:53:ad:f2 then check the dnsmasq is launched against that interface, dnsmasq --no-hosts --no-resolv --strict-order --bind-interfaces --interface=tapef85f5c3-c5 - everything on the controller behaves the same as you mentioned. and I don't have problem on instances running on the controller node. only those in compute node have network problem. Also I don’t see ovs physical bridge is been created in your show table. do you mean br-ex? the output is from the compute node. I thought there are only br-tun and br-int on the compute node. I also manually created a bridge to compare with those created by openstack and I can see vxlan packets being sent out through physical NIC. I don't understand what the difference is. here is what I did # ip tuntap add mode tap vnet0 # ip link set vnet0 up # ovs-vsctl add-br br-vxlan # ovs-vsctl add-port br-vxlan vnet0 # ovs-vsctl add-port br-vxlan tep0 -- set interface tep0 type=vxlan options:remote_ip=172.31.0.125 # qemu-system-x86_64 -m 64 -net nic -net tap,ifname=vnet0,script=no,downscript=no -hda cirros-0.3.2-x86_64-disk.img -display vnc=:1 when I ran ping in the guest VM, I can capture vxlan packets carrying ARP requests on eth0 of the host. output of ovs-vsctl show of my manually created bridge is as follows Bridge br-vxlan Controller "tcp:172.31.0.125:6633<http://172.31.0.125:6633>" Port "vnet0" Interface "vnet0" Port "tep0" Interface "tep0" type: vxlan options: {remote_ip="172.31.0.125"} Port br-vxlan Interface br-vxlan type: internal but ovs-ofctl dump-flows shows nothing OFPST_FLOW reply (OF1.3) (xid=0x2):
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