[ovs-discuss] [ovs-dev] Problem with fake bridges

[Daniele Milani]

> Date: Thu, 10 May 2012 09:21:02 -0700
> From: blp at nicira.com
> To: dano1988 at hotmail.it
> CC: discuss at openvswitch.org
> Subject: Re: [ovs-dev] Problem with fake bridges
> 
> [adding the list back, please don't drop it again]
> 
> On Thu, May 10, 2012 at 06:17:33PM +0200, Daniele Milani wrote:
> > > Date: Thu, 10 May 2012 09:07:29 -0700
> > > From: blp at nicira.com
> > > To: dano1988 at hotmail.it
> > > CC: dev at openvswitch.org; roberto.sassu at polito.it; paolo.smiraglia at polito.it
> > > Subject: Re: [ovs-dev] Problem with fake bridges
> > > 
> > > On Thu, May 10, 2012 at 05:25:51PM +0200, Daniele Milani wrote:
> > > > I have the following situation:
> > > > -I created two fake bridges on the same real bridge (br1 with tag=1 and br2 with tag=2);
> > > > -I created two virtual machines (vm1 and vm2);
> > > > -I attached the VM1 interface (vnet1) to br1, and the VM2 interface (vnet2) to br2;
> > > > -I set br1 as default route of VM1 and br2 as default route of VM2;
> > > > -if I run "$ ovs-vsctl show " I see that vnet1 tag is 1 and vnet2 is 2.
> > > > 
> > > > The problem is that, if I ping VM1 from VM2, or VM2 from VM1, the
> > > > ping succeed.
> > > 
> > > What does "ovs-vsctl show" display?
> > 
> > This is the output I obtain:
> > 
> >     Bridge realbridge
> >         Port "br2"
> >             tag: 2
> >             Interface "br2"
> >                 type: internal
> >         Port "vnet2"
> >             tag: 2
> >             Interface "vnet2"
> >         Port "vnet1"
> >             tag: 1
> >             Interface "vnet1"
> >         Port realbridge
> >             Interface realbridge
> >                 type: internal
> >         Port "br1"
> >             tag: 1
> >             Interface "br1"
> >                 type: internal
> 
> I agree that vnet1 and vnet2 should not be able to reach each other.
> 
> Run "ovs-dpctl show" and show us the output.  Then start a "ping"
> between them, with little other traffic, and while it's going run
> "ovs-dpctl dump-flows realbridge".  Also it'd be helpful to see the
> output of "route -n" and "ifconfig".
> 
> Thanks,
> 
> Ben.

This is the output I obtain:

ovs-dpctl show
    lookups: hit:32 missed:27 lost:0
    flows: 4
    port 0: br2 (internal)
    port 1: alpha-nic (internal)
    port 2: beta-nic (internal)
    port 3: vnet0
    port 4: vnet1


ovs-dpctl dump-flows br2
no output

VM1

route -n
192.168.1.0     0.0.0.0         255.255.255.0   U     0      0        0 eth0
0.0.0.0       192.168.1.1         0.0.0.0         UG    0      0        0 eth0

ifconfig
eth0      Link encap:Ethernet  HWaddr 52:94:00:02:C7:1E  
          inet addr:192.168.1.206  Bcast:192.168.1.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:21 errors:0 dropped:0 overruns:0 frame:0
          TX packets:24 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:2011 (1.9 KiB)  TX bytes:2412 (2.3 KiB)
          Interrupt:11 Base address:0x2000 

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

VM2

route -n
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
192.168.2.0     0.0.0.0         255.255.255.0   U     0      0        0 eth0
0.0.0.0       192.168.2.1         0.0.0.0         UG    0      0        0 eth0

ifconfig
eth0      Link encap:Ethernet  HWaddr 52:94:00:09:F7:1E  
          inet addr:192.168.2.166  Bcast:192.168.2.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:13 errors:0 dropped:0 overruns:0 frame:0
          TX packets:19 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:1466 (1.4 KiB)  TX bytes:2034 (1.9 KiB)
          Interrupt:11 Base address:0x2000 

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)


Daniele
 		 	   		  
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