[Mini-NDN] beginner in mini-ndn

Wed Sep 30 10:07:03 PDT 2020

Ok, I will.
 Thanks again.

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On Wed, Sep 30, 2020 at 9:52 AM Saurab Dulal (sdulal) <sdulal at memphis.edu>
wrote:

> Hi Marwa,
>
> You are welcome.
>
> Please always cc Mini-NDN mailing list whenever you send an email or
> reply. It will also help other people looking for similar questions and
> answers.
>
> Thank you,
> Saurab Dulal
> ------------------------------
> *From:* marwa kareem <m.kareem1305 at coeng.uobaghdad.edu.iq>
> *Sent:* Wednesday, September 30, 2020 11:44 AM
> *To:* Saurab Dulal (sdulal) <sdulal at memphis.edu>
> *Subject:* Re: beginner in mini-ndn
>
> Thank you very much for your help.
>
> On Mon, Sep 28, 2020 at 11:16 AM Saurab Dulal (sdulal) <sdulal at memphis.edu>
> wrote:
>
>
> ------------------------------
> *From:* marwa kareem <m.kareem1305 at coeng.uobaghdad.edu.iq>
> *Sent:* Friday, September 25, 2020 8:19 AM
> *To:* Saurab Dulal (sdulal) <sdulal at memphis.edu>
> *Subject:* Re: beginner in mini-ndn
>
>
> Hi Saurab,
> Thank you for your detailed answer,
>
> 1- I didn't realize that I should run the app from the
> /build/examples/producer so I go to the folder and run ./consumer and the
> app is working , so thank you very much for your help.
>
> 2-So do you mean that the [ndn router] in the attachment image is the
> [nodes] section in mini-ndn, so if I want to do the same network in the
> image I need 8 nodes (1 for consumer, 1 for producer and 6 for ndn router)?
>
> - Yes, you need to have 8 nodes. But all these nodes should run nfd, even
> for the nodes running consumer and producer, as they communicate with local
> nfd to send and receive packets. To put it simply, a node in Mini-NDN can
> technically run anything, forwarder, daemons, and so on. Just look at
> some of the examples and you should be able to figure out more.
>
> A real host I mean not virtual node in mini-ndn machine but  a real one (a
> host run on a virtual machine or a physical one ) so if I request a real
> content from another machine (producer) the content will be transmitted to
> my machine (consumer), is there a way to do that?
>
> - Yes, definitely you can transfer content between machines (physical),
> that's what ndn testbed is doing right now (http://ndndemo.arl.wustl.edu/).
> You need to install forwarder (nfd), set up routes, and you will be able to
> transfer packets. For more information, you can refer
> https://named-data.net/doc/NFD/current/INSTALL.html. Also, the named-data
> website is a great place to learn more about this stuff.
>
> - Mini-NDN is an emulator tool, every node has its own container, and runs
> real ndn packages. So, it's a close approximation to a real environment.
>
> 3-so if the nodes can act as (an ndn router)  in mini-ndn because the nfd
> is running on each node and each node has a cs and fib tables, what is the
> benefit of the switch in this case?
> sorry if I understand this in a wrong way but can you correct my idea
> about this subject because I'm really confused about that.
>
> - The switches in Mini-NDN are inherited from mininet, they are just the
> regular IP switches. Having said that, the switches provide the same
> functionally as IP switches and so they are there in the conf section and *they
> are not ndn-switches.*
>
> 4- I attached a paper and mark the sentence in it,  so if there is no
> ndn-switches what about the [switches] section in the .conf file in
> mini-ndn, doesn't it consider an ndn-switches? or do you mean there is no
> real ndn-switches?
>
> - NDN works at layer 3 and works with names. The layer-2 switches work
> with physical addresses. They are different and yes, you will still need
> switches. For example, AP in the wireless setup is a switch.
>
> - The paper you have attached is taking about layer-3 switch and yes
> layer-3 switches have the capability of both the router and switch, and
> sometimes are referred to as the same. For the NDN case, I would still call
> them routers rather than switch even though paper calls them the same, just
> to avoid confusion.
>
> 5- can students or researchers have access to these real ndn-routers to
> implement experiments?
>
> - Yes, you can experiment with ndn-routers. NDN testbed (
> http://ndndemo.arl.wustl.edu/) is for that very purpose. For more details
> see this page:
> https://named-data.net/ndn-testbed/policies-connecting-nodes-ndn-testbed/
>
> Regards,
> Saurab Dulal
>
>
> best regard, marwa
>
>
> On Thu, Sep 24, 2020 at 9:05 PM Saurab Dulal (sdulal) <sdulal at memphis.edu>
> wrote:
>
> Hi Marwa,
>
> Please see the inline answers.
>
> ------------------------------
> *From:* Mini-NDN <mini-ndn-bounces at lists.cs.ucla.edu> on behalf of Lan
> Wang (lanwang) <lanwang at memphis.edu>
> *Sent:* Thursday, September 24, 2020 9:03 AM
> *To:* Junxiao Shi via Mini-NDN <mini-ndn at lists.cs.ucla.edu>
> *Subject:* [Mini-NDN] beginner in mini-ndn
>
>
>
> Begin forwarded message:
>
>
> The attached message has been automatically discarded.
> *From: *marwa kareem <m.kareem1305 at coeng.uobaghdad.edu.iq>
> *Subject: **beginner in mini-ndn*
> *Date: *September 24, 2020 at 6:54:33 AM CDT
> *To: *mini-ndn at lists.cs.ucla.edu
>
>
> Hello mini-ndn team
>
> I'm still a beginner in mini-ndn , I read the documentation and
> implemented the ping stuff in the command line, but now I'm stuck in the
> next step, so could you please help me.
>
> 1-I want to implement a consumer/producer scenario however I don't know
> how to begin with that, there is consumer/producer program files in the
> ndn-cxx folder but i don't know how to use them, I try to run
> ./build/examples/producer.cpp but it don't work.
>
> I don't understand what do you mean by "it didn't work". If you want to
> test how the consumer/producer in the example folder of ndn-cxx works, you
> must compile ndn-cxx with examples i.e. ./waf configure --with-examples &&
> ./waf build && sudo ./waf install. This will create a consumer/producer app
> in ./build/examples/ folder. Now you can simply run the producer app first
> and then consumer app to see the basic interest data exchange. Remember to
> run nfd before testing consumer/producer. Just wanted to make you clear
> that this has nothing to do with Mini-NDN. In Mini-NDN, you can use any
> app/tools or whatever and can run it from a node. Say, you have a consumer
> app installed in your system. Now, you can simply run *<node> consumer*
> from Mini-NDN CLI or do the same from the experiment. Please look at:
> ndn-tools (https://github.com/named-data/ndn-tools), ndn-cxx/examples
> etc. All of these can run easily from Mini-NDN. Also, refer to mini-ndn
> <https://github.com/named-data/mini-ndn>/examples/ for some example
> experiments.
>
> 2- what is the meaning of  [nodes] section in the default-topology.conf
> file in mini-ndn, is it a host? If I want to make it a real host/node, how
> can I do that?
>
> [nodes] section represents all the nodes in a network topology. Yes, it is
> a host/node. In the topology you have attached below, [nodes] will be all
> the *NDN-Router. *See the examples/mnndn.py. It is using default-topology
> which has 4 nodes and 3 links. When you run the example, all the nodes (a,
> b...) act as a real ndn node and runs the nfd. Let me know if mean anything
> else by "real host/node".
>
> 3- how can I add a switch to the default-topology file ?
>
> There are multiple ways to add switches i) via conf file (topology file).
> Just add a section [switches] like [nodes] and add switches there ii) via
> the experiment
> https://github.com/mininet/mininet/blob/master/mininet/net.py#L249. You
> need to connect a node and a switch with a link. We will add an example for
> the switch sometime later. Also, you are most welcome to add one once you
> figure out 🙂.
>
> 4- why the switch, the router, is the same in icn/ndn? is it because it
> deal with names instead of the ip adresses so it doesn't matter if it is a
> switch or a router?
>
> I am not sure how to answer this. I don't know if there is anything called
> NDN-switches and I doubt they are same. Can you point me where you read
> them being the same?
>
> 4- in the attachment image, what is the "ndn router" , Is it the
> forwarder(nfd) that runs in the node? or is it a real router? a general
> purpose router? or it is a specific ndn software?
>
> Yes, ndn-router is a real router and yes it runs the forwarder. You can
> read this paper to get started:
> https://named-data.net/wp-content/uploads/2014/10/named_data_networking_ccr.pdf.
> You can also find more resources here:
> https://named-data.net/publications/
>
> Thank you,
> Saurab Dulal
>
> best regards, marwa
>
>
>
>
>
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