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2020 Sep 09
2
Network update disrupts network usage
Dear libvirt users,
I am encountering problems with network connections from VMs while
running net-update on the host. I would be very grateful for
suggestions of fixes or workarounds.
I am using libvirt in the context of an automated test system which
creates and destroys VMs fairly rapidly, hence network updates occur
often.
## Reproducer
The issue can be reproduced as follows.
Run in a VM:
2020 Sep 09
0
Re: Network update disrupts network usage
...ates the iptables rules, even when it makes no changes to them.
> The best fix would be to correct that.
>
> Has anyone else encountered this situation? Is there any more
> information I should provide to help with investigations? Does anyone
> have other ideas for workarounds?
The networkUpdate() method in libvirt source will recreate firewall
rules if any DHCP hosts change. This is because the firewall rules
differ when there is zero vs non-zero number of DHCP hosts present.
This could be optimized to only recreate when going from zero to
non-zero or vica-verca.
Regards,
Daniel
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