Re: [ovirt-users] IP forwarding... Cannot access guest IP

On Tue, Apr 29, 2014 at 06:33:14AM -0400, richard.seguin(a)marisec.ca wrote: > Hi Dan, > > Yes I am an ovirt user. Basically, I am running into an issue running xen > inside of kvm. Our scenario is that this is lab environment, and we > enjoy the luxury of spinning up kvm instances (as opposed to installing > on bare metal each time we need something). Our product uses Xen, and we > are pretty much stuck with it for the time being. > > I think what I am running into is a double bridge issue... Xen has a > bridge, and so does kvm obviously. I am able to ping dom0 (which is just > the bridge itself) on Xen from the outside world, but I am not able to > ping udom... and... udom doesn't have access out either. When I was > using vmware, I enabled promisc mode on the virtual switch, and this > solution worked fine... > > If we ignore the types of technology that I am using, and just focus on > the networking, what would I be looking at as possibilities? Or... a > better question would be, does ovirt have a promiscuous flag somewhere > that I can set? I cannot say that I understand your setup, but if you have nested virtuallization (such as a Xen udom) you may experience ovirt's no-mac-spoofing rule: by default we disallow our VMs to emit traffic that has different mac address from the one assigned by oVirt. To avoid this, follow http://www.ovirt.org/Vdsm_Hooks#Installing_a_hook and report if that's the issue.

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