[ndnSIM] Packet drops

[Yusung Kim]

Hello Mohammad  and Alex,

May I ask you more scenarios in which congestion happens in NDN ?

One example,  Alex said,  is drops due to queue overflows.
Is the transmission queue at Layer2 , right ?
( To Alex,  what is the default queue size ? )

Is it possible that packets are dropped at an  input interface queue ?
For example,  When lots of packets arrived from multiple input interfaces,
if the time to handle the packets ( name look-up, cache replacement.. )
increases,
new incoming packets may be dropped at input interface queues ?

If you know another scenarios about packet drops, would you let me know the
scenarios?
Thank you,

- Yusung Kim -



On Thu, Feb 28, 2013 at 5:27 AM, Alex Afanasyev <
alexander.afanasyev at ucla.edu> wrote:

> Hi Mohammad,
>
> If you're talking about normal drops due to queue overflows, then you can
> use packet drop traces from NetDevice queue (you can check examples in
> src/visualizer/model/pyviz.cc):
>
> - /NodeList/*/DeviceList/*/TxQueue/Drop
>
> If you want to factor in cases when ndnSIM stops forwarding packet (which
> is not exactly a drop), then you may want to also use
>
> - /NodeList/*/$ns3::ndn::ForwardingStrategy/DropInterests
> - /NodeList/*/$ns3::ndn::ForwardingStrategy/DropData
>
> However, I'm not confident 100% that right now ndnSIM tracks all the cases
> of stopped forwarding of Interst/Data.
>
> ---
> Alex
>
> On Feb 27, 2013, at 5:51 AM, Hovaidi Ardestani Mohammad <
> mohammad.hovaidi.ardestani at aalto.fi> wrote:
>
> > Hello everybody!
> > I have several scenarios in which congestion happens. I am wondering how
> I can trace dropped packets or know when packet dropping has been started?
> > Any help is appreciated in advance
> > BR
> > -Mohammad
>
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