Hi,
Could anyone please look into these fundamental queries of OVS & Vlan and
reply ?
Thanks & Regards
Ashish
On Thu, Oct 3, 2013 at 9:42 PM, ashish yadav <[email protected]>wrote:
> Hi,
>
> I was doing some exercise, came across few scenario.
> I need help to understand these cases.
>
> *Environment: *
> a. One Host and one VM in it
> b. OVS running:
> [root@sholay ashish]# ovs-vsctl show
> 2b113c03-81e5-4c90-ba6c-b2eb2381432a
> Bridge "ovsbr0"
> Port "ovsbr0"
> Interface "ovsbr0"
> type: internal
> Port "vnet0"
> Interface "vnet0"
> Port "eth0"
> Interface "eth0"
> ovs_version: "1.4.6"
>
> VM is up and I am able to ping:
> a. External World from VM & Host.
> b. Ping between HOST & VM fine.
>
> *Scenario 1:*
> vnet0 is vlan tag:
> [root@sholay ashish]# ovs-vsctl show
> 2b113c03-81e5-4c90-ba6c-b2eb2381432a
> Bridge "ovsbr0"
> Port "ovsbr0"
> tag: 0
> Interface "ovsbr0"
> type: internal
> Port "vnet0"
> tag: 5
> Interface "vnet0"
> Port "eth0"
> tag: 0
> Interface "eth0"
> ovs_version: "1.4.6"
>
> a. From VM, not able to ping Host machine & External world.
> b. From Host, able to ping External world.
>
> This is desired behaviour. No problem here.
>
>
> *Scenario 2:*
> ovsbr0 & vent0 are Vlan Tag:
> [root@sholay ashish]# ovs-vsctl show
> 2b113c03-81e5-4c90-ba6c-b2eb2381432a
> Bridge "ovsbr0"
> Port "ovsbr0"
> tag: 5
> Interface "ovsbr0"
> type: internal
> Port "vnet0"
> tag: 5
> Interface "vnet0"
> Port "eth0"
> tag: 0
> Interface "eth0"
> ovs_version: "1.4.6"
>
> a. VM is able to Ping host, but Fail to ping External world.
> * Why it is so ?*
> b. Host Machine Fail to ping External world.
> *Why its is so ?*
>
>
> *Scenario 3:*
> eth0 & vent0 are Vlan Tag:
> [root@sholay ashish]# ovs-vsctl show
> 2b113c03-81e5-4c90-ba6c-b2eb2381432a
> Bridge "ovsbr0"
> Port "ovsbr0"
> tag: 0
> Interface "ovsbr0"
> type: internal
> Port "vnet0"
> tag: 5
> Interface "vnet0"
> Port "eth0"
> tag: 5
> Interface "eth0"
> ovs_version: "1.4.6"
>
> a. VM able to ping external world, but fail to ping host ip.
> * Why it is so ?*
> b. Host Machine not able to ping external world.
> *Why VM can excess external world, but host not ?*
>
>
> Thanks & Regards
> Ashish
>
>
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