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[mininet-discuss] TCP-OUT-OF-ORDER segments on wireshark

Bob Lantz rlantz at cs.stanford.edu
Tue Oct 11 15:46:12 PDT 2011


I'm not entirely sure I understand your setup, but I don't think it's a mininet issue.

Ordering is not preserved if some packets go through the switch and some take a
detour to the controller. This frequently happens when flow entries expire.

On Oct 11, 2011, at 6:14 AM, andrea simeoni wrote:

> Hi guys,
> 
> I'm running a mininet with an OF switch having a flow entry with a pair of actions: 
> 
> > forward packets of the flow A on the route.
> > forward packets of the flow A to the controller.
> 
> In my test I'm using iperf and wireshark on the controller interface to inspect OF traffic. In this setting I can observe all packets that are forwarded to the controller. 
> The problem is that on the monitored interface, I observe a big amount of TCP-OUT-OF-ORDER segments. In my setting the controller is running on the HOST machine, then is outside the mininet virtual machine.
> 
> Do you have suggestions? For you is a normal behavior?
> 
> best regards.
> 
> -- 
> Andrea Simeoni
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> mininet-discuss at lists.stanford.edu
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