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Re: [Xen-users] Bridging works fine under KVM but not Xen

On Wed, 2014-01-08 at 16:09 -0600, Glenn E. Bailey III wrote:
> We specify the device_model to point to a specific version of Qemu and
> the model=e1000 to specify the use of the e1000 NIC instead of the
> default RTL. Either way I removed both lines and no change. I also did
> a xen_platform_pci=0 to see if using the non-PVHVM would work. Same
> results.

I take it that you have confirmed (with "brctl show" and "ifconfig -a")
that the vif and tap devices are being added to the bridge? Can you post
the output of those two commands while things are running please.

The other options are firewall rules and sysctl things to do with
forwarding and arps etc. Posting the output of the iptables and sysctl
commands might set of a light bulb for someone. Likewise the route
command (in all cases I mean with whatever option shows all the current

How are the guests getting their IP address? DHCP? Where is the DHCP
server? If static then are you sure all the netmasks and subnets etc are

Have you checked the in-guest network settings, like gateway and name
server? How do they compare to the working KVM guest? Have you also
compared all of the host settings (brctl, ifconfig, iptables, sysctl,
etc) in the two configurations?

Are you using Xen4CentOS or some other Xen packages or perhaps building
from source? Have you asked on any CentOS lists (they have a virt one I
think) -- there may be folks there who are aware of some quirk.


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