[ovs-discuss] OVS And GRE Tunnels

[Cali Ente]

Ahh no, I am having issues connecting a tun to OVS. I have been perusing
the documentation to see if it due to an improperly formatted
command/setup. I had the idea in my head that I needed to specify GRE for
the tun in order for OVS properly attach, but alas I misread the wiki.


On Fri, Jul 26, 2013 at 11:49 AM, Dmita Levy <dlevy022 at fiu.edu> wrote:

> OVS creates its own GRE tunnel so there is no need to have a pre-existing
> adapter or create an additional adapter as far as I know. I only suggested
> you use tunctl because I thought you would need to TAP a bridge like I do
> here:
>
> https://drive.google.com/a/fiu.edu/?tab=mo#my-drive
>
>
>
>
> On Fri, Jul 26, 2013 at 2:23 PM, Cali Ente <calientepermanente at gmail.com>wrote:
>
>> Created tunnels using tunctl, but getting back to the original question
>> posted, when I asked about using GRE with tunnels, it was stated that OVS
>> creates it's own GRE tunnel to communicate, and does not use preexisting
>> tunnels, it seems like now you are contradicting this, so just so I'm sure,
>> what is the correct answer?
>>
>> Thanks,
>> Cal
>>
>>
>> On Fri, Jul 26, 2013 at 11:19 AM, Dmita Levy <dlevy022 at fiu.edu> wrote:
>>
>>> How did you create the pre-existing tunnel? I would like to duplicate
>>> the issue you're having here on my test hosts.
>>>
>>>
>>> On Fri, Jul 26, 2013 at 2:16 PM, Cali Ente <calientepermanente at gmail.com
>>> > wrote:
>>>
>>>> tun0 is a preexisting tunnel, so what I'm trying to do is get OVS to
>>>> communicate with this preexisting tunnel.
>>>>
>>>>
>>>> On Fri, Jul 26, 2013 at 11:14 AM, Dmita Levy <dlevy022 at fiu.edu> wrote:
>>>>
>>>>> I'm still a little confused as to what it is you're trying to
>>>>> accomplish; if you create a GRE port like this
>>>>>
>>>>> #  ovs-vsctl add-port br0 tun0 -- set interface tun0 type=gre
>>>>> options:remote_ip=192.168.1.10
>>>>>
>>>>>
>>>>> the tunnel should work with no problems. From what you're saying, it
>>>>> seems like you're creating a tunnel and trying to add an additional tunnel
>>>>> adapter? What does your topology look like?
>>>>>
>>>>> On Fri, Jul 26, 2013 at 2:05 PM, Cali Ente <
>>>>> calientepermanente at gmail.com> wrote:
>>>>>
>>>>>> Are you referring to something like this?
>>>>>>   ifconfig
>>>>>>    tun0      Link encap:UNSPEC  HWaddr
>>>>>> 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00
>>>>>>           UP BROADCAST POINTOPOINT RUNNING NOARP MULTICAST  MTU:1424
>>>>>> 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:10
>>>>>>           RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
>>>>>>    ...
>>>>>> ...
>>>>>>    ovs-vsctl add-br bro
>>>>>>
>>>>>> This creates a gre port named tun0 on the bridge device bro but it
>>>>>> does not seem to be associated with the actual tun0 net device in anyway
>>>>>>
>>>>>>
>>>>>>
>>>>>> On Fri, Jul 26, 2013 at 10:42 AM, Dmita Levy <dlevy022 at fiu.edu>wrote:
>>>>>>
>>>>>>> Hello Cali,
>>>>>>>
>>>>>>> Have you tried using tunctl to create the tunnel adapter and then
>>>>>>> adding that adapter to the bridge the gre port is assigned to? That being
>>>>>>> said, what are you using the tun adapter for - is it tun/tap to tap VM's
>>>>>>> into the bridge?
>>>>>>>
>>>>>>> On Fri, Jul 26, 2013 at 1:33 PM, Cali Ente <
>>>>>>> calientepermanente at gmail.com> wrote:
>>>>>>>
>>>>>>>> As I thought, in that case, does anyone know of a way to connect a
>>>>>>>> linux tun device to OVS?
>>>>>>>>
>>>>>>>>
>>>>>>>> On Fri, Jul 26, 2013 at 9:19 AM, Jesse Gross <jesse at nicira.com>wrote:
>>>>>>>>
>>>>>>>>> On Fri, Jul 26, 2013 at 8:54 AM, Cali Ente <
>>>>>>>>> calientepermanente at gmail.com> wrote:
>>>>>>>>> > Hey all quick question, when creating a tunnel port in OVS using
>>>>>>>>> the set
>>>>>>>>> > interface=gre does this connect to a preexisting tun or does OVS
>>>>>>>>> make it's
>>>>>>>>> > own? For example I have a tun0 device that I want to attach to
>>>>>>>>> my OVS port,
>>>>>>>>> > and it cannot be added (incompatible device), so I thought that
>>>>>>>>> I merely
>>>>>>>>> > needed to add it with the GRE option.
>>>>>>>>>
>>>>>>>>> OVS GRE does not use or require an existing device.
>>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> _______________________________________________
>>>>>>>> discuss mailing list
>>>>>>>> discuss at openvswitch.org
>>>>>>>> http://openvswitch.org/mailman/listinfo/discuss
>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>>
>>>>>
>>>>
>>>
>>
>
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