[ndnSIM] Simulation halts with small lifetime of interest

[sangita......]

Hi Karan,

I don't have anything such as MaxSeq as my consumer generating data as per
Zipf Mandelbrot distribution. Here I have mentioned the Number of Content
and the interest is generated following Mandelbrot distribution.
By analysising the trace file I have seen that the simulation is stopped
after repetadely executing the function onDataUnsolicited( ) from forwarder
class.  This is because  timeout happens as for the very small lifetime of
interest and on timeout I did not generating the interest again. Therefore,
even when the data is coming back it becomes unsolicited in the nodes and
decision was to drop the data.

But again I m not getting the reason of stimulation halt. Do you have any
idea on how an unsolicited data can make the simulation halt.

Thanks and regards,
Sangita


On Wed, Sep 15, 2021, 22:45 Karan Raj Baruah <karan_baruah at yahoo.co.in>
wrote:

> Hello Sangita,
>
> Did you set "MaxSeq" variable in your simulation scenario? It could be
> that the MaxSeq value is hit when transmitting (and there are NACKs in the
> network even after re-transmission) and simulation closes. Also, if you are
> using something like WifiRemoteStation there are two variables MaxSsrc or
> MaxSlrc(depends on the packet size you used) that sets max number of
> re-transmissions for data packets which may be causing simulation to
> shutdown as none of the packets are not reaching even after repeated
> timeouts. Check this class once:
> https://www.nsnam.org/doxygen/classns3_1_1_wifi_remote_station_manager.html
>
> Might be some other issue also but hard to say without knowing scenario.
>
> Best,
> Karan Raj Baruah
>
> On Thursday, 16 September, 2021, 02:04:17 am IST, sangita...... <
> sangita.engg at gmail.com> wrote:
>
>
> Hi Karan,
> Thanks for the reply.
>
>  I kept the lifetime as 10 seconds. Your words are true that my interest
> are not reaching to any producer (destination) but as per my understanding
> that should not halt the simulation in the midway. When a interest will not
> reach to any producer , time out will happen and pit entry for those
> intereste will be evicted.
>
> Do you have a clear idea what actually happened when a time out take place
> ?
>
> Thanks and regards,
> Sangita
>
> On Wed, Sep 15, 2021, 20:47 Karan Raj Baruah via ndnSIM <
> ndnsim at lists.cs.ucla.edu> wrote:
>
> Hello Sangita,
>
> How much is the value of lifetime that you set when causing the issues?
> Also, when you set the lifetime manually can you verify from your tracer
> logs that the packets are actually sent(and duration for interest to
> reach)? It might be because latency between ports is too high that when you
> change it the interest may not reach the destination at all(even on
> retransmission).
>
> Best,
> Karan
>
>
>
>
>
>
>
>
>
> On Thursday, 16 September, 2021, 12:30:08 am IST,
> ndnsim-request at lists.cs.ucla.edu <ndnsim-request at lists.cs.ucla.edu>
> wrote:
>
> Message: 2
> Date: Wed, 15 Sep 2021 11:11:04 +0100
> From: "sangita......" <sangita.engg at gmail.com>
> To: ndnsim at lists.cs.ucla.edu
> Subject: [ndnSIM] Simulation halts with small lifetime of interest
> Message-ID:
>     <CALbsVCFQgTWn9VaK8sW-n1ftoGZ+s4t7URoV9r9F7j_HemJMqw at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> Dear members,
> I am developing a vehicular network by incorporating sumo in ndnsim using
> the traci client.
> In my simulation the consumer generates interest in some zipf-mandelbroute
> fashion. Whenever I am keeping life time of each interest smaller than the
> total simulation time, somewhere my simulation halts with the below
> message:
> Error: tcpip::Socket::recvAndCheck @ recv: peer shutdown
> Quitting (on error).
>
> However, it runs fine when I keep the lifetime of each interest bigger than
> the total simulation time.
>
> Can anyone give me any clue on what can be the problem?
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