On 07/26/2014 09:09 PM, Jonathan Rudenberg wrote:
On Jul 26, 2014, at 2:05 PM, Jonathan Rudenberg <jonathan@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)