[ovs-discuss] Questions about IPFIX

Felix Konstantin Maurer felix.maurer at comsys.rwth-aachen.de
Fri Jun 2 11:57:01 UTC 2017

I just took a look at the code, and I think it should work, as the the
timestamps are properly updated in ipfix_cache_aggregate_entries.
However, I don't know the code base well or C for that matter.
Can you point me to where the time values are not properly set?


On 05/31/2017 05:27 PM, Ben Pfaff wrote:
> On Wed, May 31, 2017 at 03:05:45PM +0200, Felix Konstantin Maurer wrote:
>> I'm currently trying to export flow statistics from an Openvswitch
>> bridge with IPFIX. It works, however in almost all packets, the
>> flowStartDeltaMicroseconds and the flowEndDeltaMicroseconds have the
>> same value. Is that to be expected? Do I misunderstand something?
>> I expected them to be different and to allow me to calculate over which
>> time period the octetDeltaCount number of bytes of the flow had been sent.
> The IPFIX code hard-codes the start and end times to the same value.
> It's too bad--it would be nice to have this be more accurate.  I don't
> know how difficult that would be.

RWTH Aachen University
Communication and Distributed Systems

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