Description of problem:
One of VM's in customer's RHOSP 16.1 ML2/OVS w DVR deployment can't obtain DHCP address after its lease expired: there are no answers from Neutron DHCP servers for inbound instance's DHCP Requests.
We have tried to isolate the problem during remote session by running "dhclient eth0" command inside affected VM and collecting traffic dumps. Here are our observations:
1. DHCP requests are seen on inbound tap interface (tcpdump is used)
2. DHCP requests are seen on appropriate linux bridge which has appropriate tap interface as a slave (tcpdump is used)
3. DHCP requests are seen on inbound br-int interface (ovs-tcpdump is used)
4. DHCP requests are not seen on outbound br-int interface (patch-tun, ovs-tcpdump is used)
I will provide UUIDs privately, sosreport from affected compute is attached to support case.
Version-Release number of selected component (if applicable):
RHOSP 16.1.6
How reproducible:
Unclear: problem is sporadic, but we have affected instance available for troubleshooting right now