Comment 1 for bug 1870083

I create the same setup and for me tcpdump sowed icmp.
I used vxlan network:
$ openstack network create tap_net --provider-network-type vxlan --provider-segment 1000
....
I have the 3 ports.
...
I have ubuntu16.04 for target vm, and cirros for dst and src.

ubuntu@vm-target:~$ sudo tcpdump -nni -vvv -i ens3 icmp

sudo: unable to resolve host vm-target: Connection timed out
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on ens3, link-type EN10MB (Ethernet), capture size 262144 bytes
14:53:58.601256 IP 192.168.103.9 > 192.168.103.22: ICMP echo request, id 44289, seq 35, length 64
14:53:58.602412 IP 192.168.103.22 > 192.168.103.9: ICMP echo reply, id 44289, seq 35, length 64
14:53:59.173048 IP 192.168.103.22 > 192.168.103.9: ICMP echo request, id 45569, seq 39, length 64
14:53:59.173560 IP 192.168.103.9 > 192.168.103.22: ICMP echo reply, id 45569, seq 39, length 64
14:53:59.602423 IP 192.168.103.9 > 192.168.103.22: ICMP echo request, id 44289, seq 36, length 64
14:53:59.603810 IP 192.168.103.22 > 192.168.103.9: ICMP echo reply, id 44289, seq 36, length 64