[ovs-discuss] Same mac address of br0 and eth0

[Jingfei Hu]

No, I haven't turned on the PROMISC bit on the OVS bridge, nor the tap0
interface used by the guest.
I can give it a try.

Cheers,

Hu Jingfei

2012/3/21 Brian Haley <brian.haley at hp.com>

> Is the PROMISC bit turned-on on the bridge?  I've seen that cause DUP-ed
> frames
> on the Linux bridge, don't know about OVS however.
>
> -Brian
>
> On 03/21/2012 01:04 AM, Jingfei Hu wrote:
> > Hi, Ben,
> > In the last few days, I have spent my spare time on figuring out the
> reason of
> > ping DUP problem. Here is my result:
> > The network setting including netmask\default gateway etc. contains no
> error.
> > Following is the ip address setting and routing table of the host and
> the guest:
> > --------------------------------------------------------------
> > Host:
> > IP address:
> > br0: 192.168.1.27 netmask 255.255.255.0
> > Routing table:
> > Destination     Gateway         Genmask         Flags Metric Ref    Use
> Iface
> > 0.0.0.0         192.168.1.1     0.0.0.0         UG    0      0        0
> br0
> > 192.168.1.0     0.0.0.0         255.255.255.0   U     0      0        0
> br0
> >
> > Guest:
> > IP address:
> > eth0: 192.168.1.26 netmask 255.255.255.0
> > Routing table:
> > Destination     Gateway         Genmask         Flags Metric Ref    Use
> Iface
> > 0.0.0.0         192.168.1.1     0.0.0.0         UG    0      0        0
> eth0
> > 169.254.0.0(link-local)     0.0.0.0         255.255.0.0     U     1000
> 0
> >  0 eth0
> > 192.168.1.0     0.0.0.0         255.255.255.0   U     1      0        0
> eth0
> > --------------------------------------------------------------
> > The ping DUP problem is still there.
> > Then in another machine, the same steps are executed with same host os
> and same
> > guest os, except that br0 is created using bridge-utils package, not
> ovs-vsctl.
> > When ping from the guest, the DUP problem has gone. So it seems that the
> bridge
> > created by ovs-vsctl is different than the bridge created by bridge-utils
> > package. Is that correct to say this problem is related to ovs?
> >
> > Cheers,
> >
> > Hu Jingfei
> >
> > 3/19 Ben Pfaff <blp at nicira.com <mailto:blp at nicira.com>>
> >
> >     I don't see how br0 and eth0 having the same MAC address would cause
> the
> >     behavior that you mention.  I would suggest following a conventional
> >     troubleshooting procedure instead of making this assumption.
> >
> >     If you want us to help with that troubleshooting then you can start
> from
> >     the suggestions in REPORTING-BUGS.
> >
> >     On Mon, Mar 19, 2012 at 10:12:17AM +0800, Jingfei Hu wrote:
> >     > Thanks, Ben,
> >     > But there is a problem here. The following commands have not
> changed:
> >     > ------------------------------------
> >     > sudo ovs-vsctl add-br br0
> >     > sudo ovs-vsctl set bridge br0 datapath_type=netdev
> >     > sudo ovs-vsctl add-port br0 eth0
> >     > sudo ovs-vsctl add-port br0 tap0
> >     > ------------------------------------
> >     > The tap0 interface is created using OpenVPN utility with following
> command:
> >     > ------------------------------------
> >     > sudo openvpn --mktun --dev tap0
> >     > ------------------------------------
> >     > Then I have created a VM using VirtualBox-4.1 and made the VM use
> the
> >     > Bridged Adapter tap0. IP address settings are:
> >     > ------------------------------------
> >     > In my host:
> >     > sudo ifconfig br0 192.168.1.24 netmask 255.255.255.0
> >     > eth0 and tap0 got no ip address assigned
> >     > In the guest, i.e. VM:
> >     > sudo ifconfig eth0 192.168.1.26 netmask 255.255.255.0
> >     > ------------------------------------
> >     > After that, my guest is able to reach the outside network, and the
> machine
> >     > which resides in the same LAN, says it's ip address is
> 192.168.1.14, could
> >     > also found my guest. The PROBLEM is:
> >     > when I ping the 192.168.1.14 from my guest, the ICMP reply is
> always
> >     > duplicated. I guess the cause is because the br0 has the same mac
> address
> >     > with eth0, but don't know how to solve it.
> >     > Any ideas will be appreciated. Sorry for the question in question,
> I should
> >     > ask it in one post.
> >     >
> >     > Cheers,
> >     > Hu Jingfei
> >     >
> >     >
> >     > 2012/3/18 Ben Pfaff <blp at nicira.com <mailto:blp at nicira.com>>
> >     >
> >     > > On Sun, Mar 18, 2012 at 10:46:36PM +0800, Jingfei Hu wrote:
> >     > > > I have installed OVS userspace program on Ubuntu Oneiric
> according to
> >     > > > INSTALL.Linux. Then I have added a bridge using following
> commands:
> >     > > >
> >     > > > sudo ovs-vsctl add-br br0
> >     > > > sudo ovs-vsctl set bridge br0 datapath_type=netdev
> >     > > > sudo ovs-vsctl add-port br0 eth0
> >     > > > sudo ovs-vsctl add-port br0 tap0
> >     > > >
> >     > > > Then I setup the bridge br0 as follows:
> >     > > > sudo ifconfig br0 192.168.1.24 netmask 255.255.255.0
> >     > > > After that, I check it with command ifconfig -a, finding that
> the mac br0
> >     > > > and eth0 have the same mac.
> >     > > >
> >     > > > Is it normal?
> >     > >
> >     > > Yes.
> >     > >
> >
> >
> >
> >
> > _______________________________________________
> > discuss mailing list
> > discuss at openvswitch.org
> > http://openvswitch.org/mailman/listinfo/discuss
>
>
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