Nox version is 5.0. It works for the version of OpenFlow on the switch (0.8.9).

I used the same function to print ofp_match field and compare the
ofp_match value in the flow statistics request and flow statistics
reply. They are exactly the same for the 10 fields (wildcards=0). But
the returned value is still always 0.
If I use wildcards=0xffffffff, then two flows returns (one is for ICMP
reply), still with byte_no 0.

On Sun, Dec 13, 2009 at 3:55 PM, Keith Amidon <[email protected]> wrote:
> I apologize if you stated this already and I missed it, but what
> versions NOX and switch software are you using?
>
>          Thanks, Keith
>
>
> On Sun, 13 Dec 2009 11:17:01 -0800, Guanyao Huang <[email protected]> wrote:
>> I dont think the flow table entries expire quickly, because I find out
>> only initially the new packet is sent to the controller. Later packets
>> already have entries.
>>
>> It seems I dont have priority to use dpctl dump-flows command. I can
>> telnet to the switches and run showflow command, which shows the flows
>> are correct, with increasing size.
>>
>> Even if I use wildcards=0xffffffff to get all flow entries and use a
>> short interval to query flow statistics (500 ms), the returned sizes
>> are still always 0.
>>
>> Now, even reading port statistics doesnt work. Returned value is 0.
>>
>> The code is already posted to this email.
>

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