[ndnSIM] Missing HopCountTag in Data Packets
Alex Afanasyev
aa at CS.UCLA.EDU
Wed Feb 8 20:21:15 PST 2017
FYI. Susmit sent me his code and after a bit of deep debugging, I discovered that this problem was actually caused by a small bug in ndnSIM. I just pushed a fix to our code review system and it should be merged as soon as all sanity checks passed.
--
Alex
> On Feb 8, 2017, at 11:59 AM, Susmit <susmit.shannigrahi at gmail.com> wrote:
>
> Hi All,
>
> I have an ndnSIM topology with one producer, multiple consumers and
> intermediate nodes. I am trying to get the hop count for incoming
> data packets at the consumers.
>
> Below are the code and the trace for a single Interest packet.
> I confirmed that I am getting data from a different node (node 64)
> than the consumer (node 54), so the reply is not from local
> cache/local producer.
>
> This is my code for consumer::onData
>
> ________________________ Code ______________________________________
>
> void
> onData(const ndn::Interest& interest, const ndn::Data& data)
> {
> auto ID = ns3::Simulator::GetContext();
> auto now = ns3::Simulator::Now().To(ns3::Time::S);
>
> int hopCount = 0;
> auto hopCountTag = data.getTag<ndn::lp::HopCountTag>();
> if (hopCountTag != nullptr) {
> hopCount = *hopCountTag;
> std::cout << "Hop count: " << *hopCountTag << std::endl;
> }
> else {
> std::cout << "Packet tag doesn't exist for " <<
> data.getName() << std::endl;
> }
> std::cout << "Time: " << now << ",node:" << ID << "
> Consumer:onData" << ",Data Name " << data.getName() << ",Hop Count
> " << hopCount << std::endl;
>
> ..............
> }
> __________________________ Trace ____________________________________
>
>
>
>
> 1. Scheduling /cmip5/app/zg_Amon_EC-EARTH_rcp45_r6i1p1_200601-205012.nc/%00%00
> at node 54 at time 1446227878 nonce 1495198176
>
> 2. Time: +1.44622787799999999995,node:54, Consumer:delayedInterest,
> Interest Name /cmip5/app/zg_Amon_EC-EARTH_rcp45_r6i1p1_200601-205012.nc/%00%00
>
> 3. Time :+1.44635877299999999996 node:64, Producer::OnInterest,
> Received interest:
> /cmip5/app/zg_Amon_EC-EARTH_rcp45_r6i1p1_200601-205012.nc/%00%00 Nonce
> : 1495198176
>
> 4. Packet tag doesn't exist for
> /cmip5/app/zg_Amon_EC-EARTH_rcp45_r6i1p1_200601-205012.nc/%00%00/1495198176
>
> 5. Time: +1.57473100799999999997,node:54, Consumer:onData, Data Name
> /cmip5/app/zg_Amon_EC-EARTH_rcp45_r6i1p1_200601-205012.nc/%00%00/1495198176,Hop
> Count 0
>
>
> I am not sure if I am missing something.
>
> Thanks for your help.
>
> --
> Regards,
> Susmit.
> _______________________________________________
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