[ovs-discuss] Problem using virtualbox with open vswitch with VLAN

Ming-Ching Tiew mctiew at yahoo.com
Wed Mar 4 22:57:22 UTC 2015


Is there a doc for the vlan_mode ?
Actually I am pretty confused with the vlan_mode setting.
In any case, I think what I want to accomplish is to make port br0, vnet0 to perform 'trunking' and port vlan100 to perform tagging for vlan 100.
My benchmark is qemu. I got it working with qemu with either vlan_mode 'native-untagged' or 'native-tagged', while setting vlan_mode=access for vlan100. Setting br0 and vnet0 to vlan_mode=trunk will make the result worse. 
The same working open vswitch configuration is not working with virtualbox. I did some sniffing or tcpdump, I think it's looks like stucked at arp reply. That's why I posted it to virtualbox forum initially.      From: Ben Pfaff <blp at nicira.com>
 To: Ming-Ching Tiew <mctiew at yahoo.com> 
Cc: "discuss at openvswitch.org" <discuss at openvswitch.org> 
 Sent: Thursday, March 5, 2015 12:36 AM
 Subject: Re: [ovs-discuss] Problem using virtualbox with open vswitch with VLAN
   
Did you add a tag?



On Wed, Mar 04, 2015 at 06:14:39AM +0000, Ming-Ching Tiew wrote:
> Please bear with me as I don't quite  understand the significance of the vlan_mode setting.
> In any case, I changed the br0 port and vnet0 port to vlan_mode=native-tagged, still guest 1 is not able to ping guest 2. The ping result is the same as before.
> 
>      From: Ben Pfaff <blp at nicira.com>
>  To: Ming-Ching Tiew <mctiew at yahoo.com> 
> Cc: "discuss at openvswitch.org" <discuss at openvswitch.org> 
>  Sent: Wednesday, March 4, 2015 1:56 PM
>  Subject: Re: [ovs-discuss] Problem using virtualbox with open vswitch with VLAN
>    
> On Tue, Mar 03, 2015 at 09:55:26PM -0800, Ben Pfaff wrote:
> 
> 
> > On Wed, Mar 04, 2015 at 01:45:44AM +0000, Ming-Ching Tiew wrote:
> > > I posted this to virtualbox forum which I got no response and now I am posting it here as it might be a openvswitch problem instead of virtualbox :-
> > > I have used virtualbox with open vswitch without any problem when I am not using VLAN.
> > > 
> > > However, when I am using VLAN tagging in one of the open vswitch port, I cannot get it working.
> > > 
> > > Here is the host ( debian 14.04 64 bit ) :-
> > > 
> > > for i in 0 1
> > > do
> > >   ovs-vsctl add-br br$i
> > >   ip tuntap add mode tap vnet$i
> > >   ip link set vnet$i up
> > >   ovs-vsctl add-port br$i vnet$i
> > > done
> > > 
> > > ifconfig br0 192.168.2.2 up
> > > ifconfig br1 192.168.3.1 up
> > > 
> > > # add a port to switch br0 to have vlan tagging
> > > ip tuntap add mode tap vlan100
> > > ip link set vlan100 up
> > > ovs-vsctl add-port br0 vlan100 tag=100
> > > 
> > > # optional settings
> > > # set other ports to trunk and untagged
> > > ovs-vsctl set port vnet0 trunks=100
> > > ovs-vsctl set port vnet0 vlan_mode=native-untagged
> > > ovs-vsctl set port br0 trunks=100
> > > ovs-vsctl set port br0 vlan_mode=native-untagged
> > 
> > It does not make sense to specify native-untagged mode without
> > specifying a tag, e.g. I guess you want to add tag=100 in each case.
> 
> Also it looks like later you actually want packets going to port vnet0
> at least in the native VLAN to be tagged.  That's native-tagged mode,
> not native-untagged mode.
> 
> 
>  


  
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