[ovs-dev] Is the Open Flow switch able to calculate the gap of sequence number

[Ben Pfaff]

Oh, it's about wireless.  OVS doesn't have special 802.11 support.

On Tue, Oct 27, 2020 at 06:51:08AM +0000, Soliman Awad Alshra´a Abdullah TU Ilmenau wrote:
> 
> Dear sir,
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> Attached you find the requested article
> 
> Thanks
> M.Sc Abdullah Soliman
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> ________________________________
> From: Ben Pfaff <blp at ovn.org>
> Sent: 26 October 2020 18:44:03
> To: Soliman Awad Alshra´a Abdullah TU Ilmenau
> Cc: ovs-dev at openvswitch.org
> Subject: Re: [ovs-dev] Is the Open Flow switch able to calculate the gap of sequence number
> 
> On Fri, Oct 23, 2020 at 02:38:06PM +0000, Soliman Awad Alshra´a Abdullah TU Ilmenau wrote:
> > OpenFLow switch is able to keep track of the sequence number of each traffic flow to detect MAC spoofing attack. Upon reception of a frame, the algorithm calculates the gap G between the sequence number of the current frame and that of the last frame received from the same source address. If G = 0, the current frame is considered as a re-transmitted frame, while if G = 1 or G = 2, the current frame is considered the right one. But, if the gap between the current frame and previous frame is in between 3 and 4096, then it is considered an abnormal sequence number.
> >
> > In my case, I use Ryu Controller and I would like to do the same work, where the switch sends the alert to the controller after the switch detects the gap.
> 
> This doesn't make sense to me.  Frames don't have sequence numbers.
> 
> Can you cite the publication that makes this claim?