[ovirt-users] guest often looses connectivity I have to ping gateway

[Gianluca Cecchi]

On Thu, Jan 26, 2017 at 8:45 AM, Pavel Gashev <Pax at acronis.com> wrote:

> Gianluca,
>
> It looks like VM doesn't receive broadcasts. It can be a network topology
> issue.
> Could you double check /sys/class/net/bond1/bonding/mode and
> /sys/class/net/bond1/bonding/slaves ?
>
> Is it possible you have another VM with the same MAC address in the same
> network segment?
>
>
Pavel, I think you are right! Thanks!
I didn't take into consideration that there is another oVirt environment
that has some VMs on this vlan..
And I found a VM with the same mac 00:1a:4a:16:01:51 (and a different ip)
Now I powered off that other VM, restarted my one and things seem ok.

What is the best way to manage when more oVirt environments has VMs on the
same vlans?

BTW: before finding the problem related to the mac I found my documents
when I used qemu-kvm on CentOS 6.3 on the same hardware pieces and I had
similar problems (it was mid 2012) and in that case I had to set
tx-checksumming off for the interfaces where I had the bridges (managed by
libvirt).
I created an init script that did the setting at boot.
I have verified that by default my network interfaces in CentOS 7.3 start
with the parameter set to on. Of course changing the setting didn't solve
my problem because was mac related...
But Is there any reference about it and what would be the best setting and
why?

Thanks again in the mean time ;-)
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.ovirt.org/pipermail/users/attachments/20170126/df4a53ab/attachment.html>