Public bug reported:
In my network environment floating IPs are not reachable after live VM
migration. I am using the Mitaka release with neutron DVR.
1) spawn a VM
2) assign a floating IP
3) live migrate the VM
4) ping the floating IP
Using tcpdump I identified the reason for this problem: There is no gratuitous
ARP reply sent out by the new host after live migration. Thus the network
switch sends the traffic to the old host.
If I manually send the GARP on the new host using:
root@compute-2:~# ip netns exec fip-a46e0978-6e87-43d4-85d3-1d7030cdaf49
arping -A -I fg-de83cc57-32 FLOATING_IP
the floating IP comes up again and everything works as expected.
Version:
Mitaka on Ubuntu Trusty
Kernel 3.19
Deployed using Fuel 9.0
** Affects: neutron
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1602436
Title:
DVR: floating IP not reachable after live migration
Status in neutron:
New
Bug description:
In my network environment floating IPs are not reachable after live VM
migration. I am using the Mitaka release with neutron DVR.
1) spawn a VM
2) assign a floating IP
3) live migrate the VM
4) ping the floating IP
Using tcpdump I identified the reason for this problem: There is no
gratuitous ARP reply sent out by the new host after live migration. Thus the
network switch sends the traffic to the old host.
If I manually send the GARP on the new host using:
root@compute-2:~# ip netns exec fip-
a46e0978-6e87-43d4-85d3-1d7030cdaf49 arping -A -I fg-de83cc57-32
FLOATING_IP
the floating IP comes up again and everything works as expected.
Version:
Mitaka on Ubuntu Trusty
Kernel 3.19
Deployed using Fuel 9.0
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https://bugs.launchpad.net/neutron/+bug/1602436/+subscriptions
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