[ovs-discuss] creating a mgmt0 port and not able to ping it?

Scott Lowe scott.lowe at scottlowe.org
Mon Nov 24 16:55:28 UTC 2014

Please see my responses inline, prefixed by [SL].

On Sun, Nov 16, 2014 at 06:24:20PM -0800, frank weed wrote:

> I haved been trying to configure openvswitch to where I have a port for the
> host that will be the mgmt port and then have virtual machine client
> connected to it as well.  Here is my setup:
> [root at localhost ~]# cat /etc/redhat-release
> CentOS Linux release 7.0.1406 (Core)
> [root at localhost ~]# uname -a
> Linux localhost.localdomain 3.10.0-123.el7.x86_64 #1 SMP Mon Jun 30
> 12:09:22 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
> Machine Type: Virtualbox
> [root at localhost ~]# ovs-vsctl show
> xxxxxxx-xxxx-xxxxx-xxxx-xxxxx
>    Bridge "ovsbr0"
>        Port "enp0s3"
>            Interface "enp0s3"
>        Port "ovsbr0"
>            Interface "ovsbr0"
>                type: internal
>        Port "mgmt0"
>            Interface "mgmt0"
>                type: internal
>    ovs_version: "2.3.0"
> If I try to configure mgmt0 with the host ip, and I can not ping to the
> host or out side of the host.  If I configure the ovsbr0 with the host ip,
> I can ping host and ping out side of the host. I even tried not configuring
> the interfaces with an ip and just setup openvswitch. I can see on tcpdump
> that the port mgmt0 is getting arp requests from other hosts. If I setup
> mgmt0 with the host ip I do not see tcpdump getting any arp request on the
> mgmt0 port.
> My question is, I am wondering why mgmt0 is not accessible on the network
> when it is configured with a host ip. Also, is their something that I am
> missing that I need to make this setup work?

Hi Frank, this is a setup that *should* work. A few questions/thoughts:

- You should not have an IP address assigned to enp0s3, which I'm assuming is the physical interface in this VirtualBox VM. And the link status for this interface is up, yes?

- In addition to assigning an IP address to mgmt0, make sure you actually set the mgmt0 interface to up ("ip link set mgmt0 up", if memory serves correctly).

- Stupid question, I know, but you're sure that the VirtualBox networking configuration isn't getting in the way, right?

- Using "ovsbr0" instead of "mgmt0" is functionally equivalent, as far as I know. The fact that assigning an IP address to ovsbr0 works but mgmt0 doesn't work leads me to believe the issue is with the configuration/operation of the mgmt0 interface.


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