send_fake_arp lost during live migration

send_fake_arp lost during live migration

[Cristian Zamfir]

Hi,

I think that the ARP broadcast sent by send_fake_arp in netfront.c gets 
lost during live migration even though it is called during migration in 
backend_changed(). Therefore, the outage is aroung 2s instead of tens of 
ms as expected.

I am able to see in tcpdump the ARP broadcast when domU boots, but not 
when it is live migrated.

I have also noticed a strange behaviour or arping. When I arping any 
host from domU it stops after sending and receiving the first probe.

Has anyone else experienced this problem?

I am using xen 3.0.3 and this is my network setup:

vif = ['mac=00:16:3E:F6:BB:01']
dhcp="off"
ip="130.209.253.132"
netmask="255.255.240.0"
gateway="130.209.240.48"
hostname="raoul"


Thank you.

Cristian