[ndnSIM] Wifi and p2p links on a single node.

Hassan Sinky sinkyh at oregonstate.edu
Sat Mar 26 14:08:58 PDT 2016

Thanks Sabet!

So your suggestions finally worked. I tried multicast before but it would
not work.  Setting the forwarding strategy to multicast AND setting
ndnGlobalRoutingHelper.AddOrigins(all nodes) fixes this issue. I guess the
unfortunate question remains, does this mean I will not be able to use a
best-route forwarding strategy for this scenario? Or is there a way around
this? I essentially want best-route to be used only for the p2p links.

On Sat, Mar 26, 2016 at 3:18 AM, Muhammad Hosain Abdollahi Sabet <
M.AbdollahiSabet at mail.sbu.ac.ir> wrote:

> Hmmm.
> I suggest testing 2 more things.
> 1- Set forwarding strategy to *multicast*
> 2- Manually AddOrigin to the producer for requester and intermediate nodes.
> Where is your producer application(responsible for "/myprefix") has been
> set?
> Sabet
> ------------------------------
> *From:* Hassan Sinky [mailto:sinkyh at oregonstate.edu]
> *Sent:* Sat 3/26/2016 2:16 PM
> *To:* Muhammad Hosain Abdollahi Sabet
> *Cc:* ndnsim at lists.cs.ucla.edu
> *Subject:* Re: [ndnSIM] Wifi and p2p links on a single node.
> That's what I thought but for some reason there seems to be a forwarding/
> Wifi issue that I can't seem to solve. I'm not sure what the source of the
> problem is so I simplified my topology in order to see if the problem
> persists and it does. My simplified topology is below:
> [image: Inline image 2]
> Nodes 0-3 are connected to each other via p2p links. Each of them also
> have a Wifi device for node 4 to associate with. When node 4 is associated
> with node 0 it is not able to retrieve data from the producer on node 3.
> Only when it is associated with node 2 is it able to retrieve data from
> node 3:
> [image: Inline image 4]
> Strangely, removing the Wifi devices from all the nodes except for node 0
> allows for node 4 to retrieve data from the producer when it is associated
> with node 0:
> [image: Inline image 5]
> This has puzzled me for the past two days. I have set up the NDN stack and
> routing as done in the examples:
>    //Install NDN stack on all nodes
>   NS_LOG_UNCOND ("Install NDN Stack to Nodes.");
>   ndn::StackHelper ndnHelper;
>   ndnHelper.SetDefaultRoutes(true);
>   ndnHelper.setCsSize(10);
>   ndnHelper.InstallAll();
>   //Choosing forwarding strategy
>   NS_LOG_UNCOND ("Installing NDN forwarding strategy.");
>   ndn::StrategyChoiceHelper::InstallAll("/myprefix",
> "/localhost/nfd/strategy/best-route");
>   NS_LOG_UNCOND ("Initialize Global Routing.");
>   ndn::GlobalRoutingHelper ndnGlobalRoutingHelper;
>   ndnGlobalRoutingHelper.InstallAll();
>   ndnGlobalRoutingHelper.AddOrigins("/myprefix", grid.GetNode(0,3));
>   ndn::GlobalRoutingHelper::CalculateRoutes();
> Are there additional configurations that I may have missed?
> Thanks!
> On Fri, Mar 25, 2016 at 10:20 PM, Muhammad Hosain Abdollahi Sabet <
> M.AbdollahiSabet at mail.sbu.ac.ir> wrote:
>> Hi Hassan,
>> I don't see why it's not possible. If Node50 receives interest on wifi
>> face(WifiNetDevice), it can answer regardless of knowing who has requested
>> on that face.
>> Thanks,
>> Sabet
>> ---------- Forwarded message ----------
>> From: Hassan Sinky <sinkyh at oregonstate.edu>
>> Date: Sat, Mar 26, 2016 at 7:04 AM
>> Subject: Re: [ndnSIM] Wifi and p2p links on a single node.
>> To: ndnsim at lists.cs.ucla.edu
>> Actually I'd like to revise my previous message. This topology works
>> fine, however, the only issue is if I add a WiFi net device to "Node50" for
>> when "Node52" associates with "Node50" data should be delivered to "Node52"
>> via WiFi. Is this possible?
>> On Fri, Mar 25, 2016 at 6:15 PM, Hassan Sinky <sinkyh at oregonstate.edu>
>> wrote:
>>> Hello everyone,
>>> I have the following topology:[image: Inline image 2]
>>> "Node51" and "Node52" are connected via WiFi. Whereas "Node51" and
>>> "Node50" are connected via a p2p link. "Node50" is the producer. For some
>>> reason when node "Node52" requests data from the producer "Node50" does not
>>> respond. However, if I make "Node51" the producer the content is delivered
>>> without issue. Does ndnsim not support this particular multihop scenario?
>>> If so, is there a workaround to this as it seems like a very basic and
>>> practical scenario for NDN. Any help would be greatly appreciated.
>> _______________________________________________
>> ndnSIM mailing list
>> ndnSIM at lists.cs.ucla.edu
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