[Ndn-interest] Question about unsatisfied Interests

[Xiaoke Jiang]

Hi Marco,
   This paper   http://named-data.net/wp-content/uploads/comcom-stateful-forwarding.pdf give more details on how stateful data plane helps to get rid of some kinds of attacher.





On Wednesday, 15 October, 2014 at 8:13 am, Junxiao Shi wrote:

> Hi Marco
> 
> If Router2 has a Route toward the ContentProvider for this Name, it cannot detect the content doesn't exist.
> 
> ContentProvider should reply with a provider-generated NACK, which is a type of Data, that indicates the non-existence of this content. A provider-generated NACK is cachable on routers.
> A future Interest toward this Name would be satisifed by this provider-generated NACK from the ContentStore, and doesn't have to go to the ContentProvider.
> 
> Yours, Junxiao
> 
> On Wed, Oct 15, 2014 at 8:01 AM, Marco Ulgelmo <marco.ulge at gmail.com (mailto:marco.ulge at gmail.com)> wrote:
> > Hello,
> > 
> > I've recently began studying how NDN works and i have a question about unsatisfied Interests.
> > 
> > Lets say that an attacker generates a fake Interest packet that surely doesn't exist. Let's assume that this packet is identified by the following name: /google/randomtext
> > 
> > As far as i know i shuold be able to reach /google but i won't be able to retrieve the content as it doesn't exist.
> > 
> > Considering the following scenario:
> > 
> > Interest -> Router1 -> Router2 -> Content Provider.
> > 
> > Is Router2 able to determine that the content doesn't exist? Can this information be sent back to Router2 from the Content Provider (which surely knows that he doesn't have that resource)?
> > 
> > Thanks,
> > 
> > Marco
> > 
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