Date: Thu, 22 Mar 2012 15:11:44 -0400 From: laine@laine.org To: libvir-list@redhat.com Subject: Re: [libvirt] Problem with Open vSwitch and dnsmasq

On 03/22/2012 09:10 AM, Daniele Milani wrote:

...

Dear all, I have the following situation: -I replaced the standard bridge driver with the Open VSwitch one;

I'm curious what you mean by this.

libvirt's virtual networks currently only support the standard linux bridge device. There is no code in libvirt to use openvswitch devices for libvirt's virtual networks. The openvswitch support in libvirt only applies to guest devices that use <interface type='bridge'>.

...

From your message, it sounds like there is a driver that that replaces the linux host bridge driver with something that emulates that driver, but is actually an openvswitch bridge on the backend. I hadn't previously heard of this. I did it by installing Open vSwitch with kernel modules: % ./configure --with-linux=/lib/modules/`uname -r`/build after that I replaced the standard linux bridge driver by executing: % rmmod bridge % insmod datapath/linux/brcompat.ko% ovs-brcompatd --pidfile --detachyou can find all this information at: http://openvswitch.org/cgi-bin/gitweb.cgi?p=openvswitch;a=blob_plain;f=INSTA... http://openvswitch.org/cgi-bin/gitweb.cgi?p=openvswitch;a=blob_plain;f=INSTA... Daniele Milani

...

-I started a NAT-network on Libvirt (bridge name virbr1); -I started a Virtual Machine (VM1) on Libvirt, and I tagged his interface (vnet0) with tag=2; -if I run "# ovs-vsctl show" I obtain:

Bridge "virbr1" Port "vnet0" tag: 2 Interface "vnet0" Port "virbr1-nic" Interface "virb1-nic" Port "virbr1" Interface "virbr1" type: internal

-the problem is that it is impossible to assign to VM1 an IP, because the dnsmasq daemon does not accept the tagged DHCP Discover frame.

Does someone know if there is a way for dnsmasq to accept tagged frames through "virbr1", and send a tagged DHCP Offer packet back to VM1?

-- libvir-list mailing list libvir-list@redhat.com https://www.redhat.com/mailman/listinfo/libvir-list