[ovs-discuss] Facing Internet Connection issue after adding vlan tag in OVS

Geza Gemes geza.gemes at gmail.com
Fri Nov 4 16:29:12 UTC 2016


On 11/04/2016 01:36 PM, gowthami prakala wrote:
> Hi ,
>
>
> After adding vlan tag, not able to reach external network(ie ping 
> www.google.com <http://www.google.com> failed).The following commands 
> used,
>   In Host Machine,
> sudo ovs-vsctl add-br br0
> sudo ovs-vsctl add-port brlan0 eth0
> sudo ifconfig eth0 0
> sudo ifconfig brlan0 192.168.1.100 netmask 255.255.255.0
> sudo ifconfig brlan0 up
> sudo route add default gw 192.168.1.1 br0
> sudo ip tuntap add mode tap vport1
> sudo ip tuntap add mode tap vport2
> sudo ifconfig vport1 up
> sudo ifconfig vport2 up
> ping www.google.com--success
> sudo ovs-vsctl add-port brlan0 vport1
> sudo ovs-vsctl add-port brlan0 vport2
> sudo ovs-vsctl show
>
> VM1 configured as vport1
> ping www.google.com <http://www.google.com> in VM1-->success
> VM2 configured as vport2
> ping www.google.com <http://www.google.com> in VM2-->success
>
> In Host Machine,
> sudo ovs-vsctl set port vport1 tag=10
> ping www.google.com <http://www.google.com> in VM2-->failed
> sudo ovs-vsctl set port vport2 tag=10
> ping www.google.com <http://www.google.com> in VM2-->failed
>
> Please give suggestions to resolve above issue
>
>
> _______________________________________________
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> discuss at openvswitch.org
> http://openvswitch.org/mailman/listinfo/discuss

Hi,

By tagging the traffic coming from vport1 and vport2 you've told OVS, 
that there will be some other switch in the network, which will know how 
to handle tag=10, if you don't have a switch configured to forward 
packets having tag=10 they will be just dropped at some point of the 
network which drops tagged packets in absence of a different configuration.

Cheers,

Geza

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