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Re: [libvirt] Problem with Open vSwitch and dnsmasq

I think I could try the first solution. Can you explain me how do I create the port used by dnsmasq?

For example, is it correct to execute
# ovs-vsctl add-port virbr1 port2 tag=2
to create a port for the vLan whose tag is 2 named "port2"?

Daniele Milani

Date: Thu, 22 Mar 2012 10:54:21 -0700
Subject: Re: [libvirt] Problem with Open vSwitch and dnsmasq
From: aatteka nicira com
To: dano1988 hotmail it
CC: libvir-list redhat com; roberto sassu polito it

On Thu, Mar 22, 2012 at 6:10 AM, Daniele Milani <dano1988 hotmail it> wrote:
Dear all,
I have the following situation:
-I replaced the standard bridge driver with the Open VSwitch one;
-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?

I believe you would need to run dedicated dnsmasq process instance per each VLAN that you have. By
default I guess dnsmasq runs on virbr1, hence it does not see the tagged traffic that comes from vnet0.

You could try to:
  1. add another port to that bridge with the same VLAN as VM has. And run a separate instance of dnsmasq there; or

change the tag of virb1 port, but this might lead to other issues (e.g. then non-tagged VMs will not get DHCP leases).
Perhaps someone else can suggest something easier...

Daniele Milani

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