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

Thu Mar 5 08:53:43 UTC 2015

I got additional info now.
It's seems there is a corruption of data when packets are read on the guest 1 when reading the vlan-tagged data. I did a tcpdump on guest 1 when guest2 tries to ping to guest 1, one can see that mac address of guest2 ( the initiator of arp request ) is wrong, and it also goes to the wrong destination mac address :-
08:19:28.469448 2f:33:81:00:00:64 > ff:ff:08:00:27:cc, ethertype ARP (0x0806), length 60: Request who-has 192.168.100.2 tell 192.168.100.3, length 4608:19:29.464121 2f:33:81:00:00:64 > ff:ff:08:00:27:cc, ethertype ARP (0x0806), length 60: Request who-has 192.168.100.2 tell 192.168.100.3, length 4608:19:30.463983 2f:33:81:00:00:64 > ff:ff:08:00:27:cc, ethertype ARP (0x0806), length 60: Request who-has 192.168.100.2 tell 192.168.100.3, length 4608:19:31.470218 2f:33:81:00:00:64 > ff:ff:08:00:27:cc, ethertype ARP (0x0806), length 60: Request who-has 192.168.100.2 tell 192.168.100.3, length 4608:19:32.463634 2f:33:81:00:00:64 > ff:ff:08:00:27:cc, ethertype ARP (0x0806), length 60: Request who-has 192.168.100.2 tell 192.168.100.3, length 4608:19:33.463215 2f:33:81:00:00:64 > ff:ff:08:00:27:cc, ethertype ARP (0x0806), length 60: Request who-has 192.168.100.2 tell 192.168.100.3, length 46
The arp requestor's mac address ( guest 2 ) which is supposed to be (08:00:27:cc:3f:33 ) has become 2f:33:81:00:00:64, and the arp requests have sent to ff:ff:08:00:27:cc which is supposed to be ( ff:ff:ff:ff:ff:ff ). 
Furthermore it's supposed to be a ethertype 8021q traffic, but the tcpdump is not seeing it as such ! 
Total corruption !!! No wonder cannot ping.
Earlier I said the the host was able to ping to guest1 via the VLAN 100 but that's about all that it can do. Only ping is successful, other communications failed. When I try to do a ssh session over it from guest 1 to the host, it could not be established. Communication over the untagged data is still successful. 
Looks like I am stepping into a can of worms with regards to the support of VLAN tagged traffic with the use of open vswitch with virtualbox ! ;)

     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 2:03 PM
 Subject: Re: [ovs-discuss] Problem using virtualbox with open vswitch with VLAN

On Thu, Mar 05, 2015 at 01:23:58AM +0000, Ming-Ching Tiew wrote:
> Thanks for the info !
> After reading the doc, I believe my settings should be like this :-
> port vnet0: vlan_mode=trunk, and trunk setting should be either empty or a list including vlan id's including 0 and 100 ( I want both the eth0 and eth0.100 to work ).
> port br0: same as port vnet0.
> port vlan10: vlan_mode should be access, and tag is 100. Trunk should not be set.
> So it is still not working in virtualbox but it's working in qemu.
> Do you think it's a bug with virtualbox ?

I don't know.  I don't feel confident that we're communicating well, so
I hesitate to blame some other program.

> Btw, I could not find a command which list the configured
> vlan_mode. 'ovs-vsctl show' does not list the vlan_mode.      

"ovs-vsctl list port" will do it.

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