Closing based on my last comment, please re-open if necessary.
** Changed in: neutron
Status: Confirmed => Won't Fix
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https://bugs.launchpad.net/bugs/1767811
Title:
[DVR] br-int in compute node will send unknown unicast to sg-xxx
Status in neutron:
Won't Fix
Bug description:
Environment:
Installation: devstack
Dataplane: OpenVSwitch
Version: Ocata/Stable
Nodes: Two nodes. One node with controller services and network
services(dvr_snat), the other node with compute service and network
services(dvr)
Setups to reproduce:
1. Create networks and DVR and connect them, enable snat.
2. Boot one VM in compute node
3. Ping 8.8.8.8 inside the VM
4. tcpdump the tap device of VM
Observation:
$ sudo tcpdump -nei tap8b25d590-09
fa:16:3e:63:0c:57 > fa:16:3e:c8:7a:67, ethertype IPv4 (0x0800), length
98: 10.0.0.6 > 8.8.8.8: ICMP echo request, id 22273, seq 343, length 64
fa:16:3e:c8:7a:67 > fa:16:3e:ba:67:74, ethertype IPv4 (0x0800), length
98: 10.0.0.6 > 8.8.8.8: ICMP echo request, id 22273, seq 343, length 64
fa:16:3e:ba:67:74 > fa:16:3e:63:0c:57, ethertype IPv4 (0x0800), length
98: 8.8.8.8 > 10.0.0.6: ICMP echo reply, id 22273, seq 343, length 64
Relationship between IP address and MAC address:
VM 10.0.0.6 fa:16:3e:63:0c:57
qr-xxx 10.0.0.1 fa:16:3e:c8:7a:67
sg-xxx 10.0.0.8 fa:16:3e:ba:67:74
Error:
VM should not capture "fa:16:3e:c8:7a:67 > fa:16:3e:ba:67:74",
because it should be an unicast from qr-xxx to sg-xxx. It appears that
in br-int, there is no fdb record for fa:16:3e:ba:67:74, so br-int
will flood frames destined to "fa:16:3e:ba:67:74" to every port in the
same local VLAN. So, VM can capture this unknown unicast.
Since every device in the same local VLAN on the same br-int can
capture the flooded unknown unicast, it will have impact on
performance and security.
Expect:
"qr-xxx to sg-xxx" should mainly be unicast.
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