[ndnSIM] ndnSIM Digest, Vol 97, Issue 5

Wed Dec 9 11:59:43 PST 2020

Hi All,

Thanks for your information! That really helps!

Sincerely,
Shuai

On Mon, Dec 7, 2020 at 8:33 PM <ndnsim-request at lists.cs.ucla.edu> wrote:

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> Today's Topics:
>
>    1. Related configuration about producer in ndnSIM (Shuai Dong)
>    2. Re: Multiple prefixes in one ndnSIM scenario, printing PIT
>       and FIB (Hussein AlOmaisi)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Mon, 7 Dec 2020 16:46:45 -0600
> From: Shuai Dong <sdong7 at crimson.ua.edu>
> To: ndnsim at lists.cs.ucla.edu
> Subject: [ndnSIM] Related configuration about producer in ndnSIM
> Message-ID:
>         <
> CAENDnDCJCokKc5zzs2Db7GTiWHPjnLxtJnUX-rBZbMKjW8WK2Q at mail.gmail.com>
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> Hi All,
>
> In a wireless environment, will the producer rebroadcast the interest if
> this producer does not have the corresponding data? If so, is there any way
> to prevent the producer from rebroadcasting?
>
> Thanks!
> Shuai
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> Message: 2
> Date: Tue, 8 Dec 2020 02:31:18 +0000 (UTC)
> From: Hussein AlOmaisi <alomaisi2004 at yahoo.com>
> To: "ndnsim at lists.cs.ucla.edu" <ndnsim at lists.cs.ucla.edu>
> Subject: Re: [ndnSIM] Multiple prefixes in one ndnSIM scenario,
>         printing PIT and FIB
> Message-ID: <1891307540.3470944.1607394678219 at mail.yahoo.com>
> Content-Type: text/plain; charset="utf-8"
>
> Hi Shuai,
> Regarding your questions, I would like to answere based on my little
> experice wiht ndnSIM
> Question (1), you need to make sure that consumer, producer and forwarding
> strategy are using same namespace (prefix) otherwise you will get such
> output "NACK message with reason No Route". Producer and forwarding
> strategy work for only the prefix they support (by default). You can have
> multiple consumers, producers and forwarding strategies in one scenario,
> please see the example in the following link.
>
>
> https://github.com/named-data/IPoC/blob/master/ndnSIM/examples/ndn-different-strategy-per-prefix.cpp
>
> I will assume that you are working in a wireless scenario. Regarding
> creating an entry in FIB for the new used prefix, I think you do not need
> to do it (did you do it for "prefix0"? I don't think so.)?.
> NDN-Stack-helper (ndn::StackHelper) will create a default route in FIB the
> represent the last resort route for forwarding Interest packet if no
> matching with other routes in FIB. This default? route is "/" via a face
> that is linked with the NetDevice. Make sure that face is in AD-HOC mode.
>
> Question (2), printing PIT and? FIB tables. please see the below code. It
> is a simple code that can help in how the process of printing PIT and FIB
> is done. you can modified to meet your scenario aims. Also, I highly
> recommend you to go through "NFD Developer?s Guide" for understanding the
> structures and semantics of PIT and FIB tables.
>
> void printPitFib(NodeContainer &nodes){ //numNode variable is the number
> of nodesstd::cout << endl << "---- PIT ----"<< endl;
>  for (uint32_t i = 0; i < numNodes; i++) { std::cout << endl << "node(" <<
> i << "):" << endl; auto node =  nodes.Get(i); auto& nodePit =
> node->GetObject<ndn::L3Protocol>()->getForwarder()->getPit();
> nfd::Pit::const_iterator iter; for (iter = nodePit.begin(); iter !=
> nodePit.end(); iter++) { cout << iter->getName() << endl << " Period : " <<
> iter->dataFreshnessPeriod << endl; } }
>  std::cout << endl << "---- FIB ----"<< endl;
>  for (uint32_t i = 0; i < numNodes; i++) { std::cout << endl << "node(" <<
> i << "):" << endl; auto node =  nodes.Get(i); auto& nodePit =
> node->GetObject<ndn::L3Protocol>()->getForwarder()->getFib();
> nfd::Fib::const_iterator iter; for (iter = nodePit.begin(); iter !=
> nodePit.end(); iter++) { { cout << iter->getPrefix();
> if(iter->hasNextHops()) { auto& nextHops= iter->getNextHops();
> nfd::fib::NextHopList::const_iterator ii;  for(ii = nextHops.begin(); ii !=
> nextHops.end(); ii++) cout << " : " << (unsigned) ii->getFace().getId() <<
> endl; } } } }
>
> }
>
> I hope it helps.
>
>  Best regards,Hussein
>
>     On Tuesday, December 8, 2020, 4:00:06 AM GMT+8,
> ndnsim-request at lists.cs.ucla.edu <ndnsim-request at lists.cs.ucla.edu>
> wrote:
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> Today's Topics:
>
> ? 1. Re: ndnSIM Digest, Vol 97, Issue 3 (Shuai Dong)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Mon, 7 Dec 2020 11:34:21 -0600
> From: Shuai Dong <sdong7 at crimson.ua.edu>
> To: ndnsim at lists.cs.ucla.edu
> Subject: Re: [ndnSIM] ndnSIM Digest, Vol 97, Issue 3
> Message-ID:
> ??? <CAENDnDB1WhW=ENQqpXLm2qjWQPgavj+ZObMZdCXEq3cwnt+Rnw at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> Hi DJAMA,
>
> Thanks for your information!
> In this scenario, when the consumer sends interest with "prefix0", it works
> very well and the consumer can receive the data packet.
> However, if the consumer sends interest with "prefix1", the log shows that:
> "[INFO ] NACK received for: >>>> /prefix1/%FE%01, reason: NoRoute"
> "[INFO ] NACK received for: >>>> /prefix1/%FE%02, reason: NoRoute"
> "[INFO ] NACK received for: >>>> /prefix1/%FE%03, reason: NoRoute"
> "[INFO ] NACK received for: >>>> /prefix1/%FE%04, reason: NoRoute"
> "[INFO ] NACK received for: >>>> /prefix1/%FE%05, reason: NoRoute"
> ........
>
> There are two questions that I cannot understand very well:
> 1. By default (in wireless environment), ndn can only handle? one namespace
> on one node?? If I want to install a different namespace on the other node,
> e.g., "prefix1" on producer2. I need to create a FIB entry for "prefix1" by
> myself?
>
> 2. How to print the FIB and PTI table for each node?
>
>
> Thank you very much!
> Sincerely
> Shuai
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