On 07/26/2014 09:09 PM, Jonathan Rudenberg wrote:
On Jul 26, 2014, at 2:05 PM, Jonathan Rudenberg
<jonathan(a)titanous.com> wrote:
> I’m running into an issue with libvirt-lxc networking. I have an init program that
configures the eth0 interface with an IP and gateway when the container starts. I noticed
that programs running in the container encountered “no route to host” errors and looked
into it further. What I found is that ARP packets are not making it onto the gateway
during the first few seconds of the container’s life.
I found the issue: STP was enabled on the virbr0 which spends 2s in each of the Listening
and Learning states by default before enabling the interface.
A simple `brctl stp virbr0 off` solves this issue.
To avoid needing to manually set it in the future, you can set it in
libvirt's default network configuration. Just edit it:
virsh net-edit default
and change the <bridge> line to this:
<bridge name='virbr0' stp='off'/>
I'm surprised that leaving stp='on' with delay='0' would still create
this behavior - can you verify that is current setting for your default
network (use "virsh net-dumpxml default" to see the current setting)