[ovs-discuss] question about the OVS-OFCTL

terryxing xingtianyi at gmail.com
Thu Nov 21 05:14:12 UTC 2013


Thanks Asadullah,

I did try to add dl_type=0x0800 before, unfortunately, it did not help.


On Wed, Nov 20, 2013 at 8:53 PM, Asadullah Hussain <asadxflow at gmail.com>wrote:

> Just a suggestion, Try "dl_type=0x0800" (ethernet packets) in the rule
> too. This may help in rule matching too.
>
>
> On 21 November 2013 05:23, terryxing <xingtianyi at gmail.com> wrote:
>
>> Hi Ben,
>>
>>
>> I have three VMs, I want like this, VM1 ping VM2, duplicate the packets
>> to VM3
>>
>> root at node-35:~# ovs-ofctl add-flow br-int
>> "dl_src=VM1,priority=100,actions=NORMAL,mod_dl_dst=vm3_mac_address,NORMAL"
>>
>> I can use the above command to make the packet first output to normal,
>> and then modify the destination mac and output to normal again (reach the
>> modified dest_mac). It works fine ! I run tcpdump on VM3 and I saw it
>> capture the packet from VM1 to VM2.
>>
>> But, when I use the IP address  (by changing nw_src nw_dst) to do the
>> same thing, the tcpdump on VM3 only shows that
>>
>> "ARP, request who-has VM2 IP tell VM2IP"
>>
>>
>> Do you know how can I make it work by matching and modifying  IP header
>> instead of mac ?
>>
>> Thanks very much
>>
>>
>> On Tue, Nov 12, 2013 at 10:32 AM, terryxing <xingtianyi at gmail.com> wrote:
>>
>>> I tried the add-flow command before, and it is just there when I use
>>> dump-flows to see the flow table. I am just wondering that if it will just
>>> staying there if I keep the OVS running.
>>>
>>> BTW, the port mirroring works, Thank your so much.
>>>
>>>
>>> On Tue, Nov 12, 2013 at 10:30 AM, Ben Pfaff <blp at nicira.com> wrote:
>>>
>>>> When you try it, what do you see?
>>>>
>>>> On Tue, Nov 12, 2013 at 09:56:27AM -0800, terryxing wrote:
>>>> > it is okay for the short-lived controller exit, but will the rule
>>>> last in
>>>> > OVS If I just keep it running ?
>>>> >
>>>> >
>>>> > On Tue, Nov 12, 2013 at 8:00 AM, Ben Pfaff <blp at nicira.com> wrote:
>>>> >
>>>> > > On Mon, Nov 11, 2013 at 11:23:36PM -0800, terryxing wrote:
>>>> > > > What do you mean by short-lived ? How long it can last and can I
>>>> save the
>>>> > > > flowtable ?
>>>> > >
>>>> > > Most controllers run until you stop them.  ovs-ofctl connects and
>>>> > > executes the command you give it, then exits.
>>>> > >
>>>>
>>>
>>>
>>
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>>
>>
>
>
> --
> Asadullah Hussain
>
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