[Ndn-interest] Question about unsatisfied Interests

Junxiao Shi shijunxiao at email.arizona.edu
Wed Oct 15 08:13:57 PDT 2014


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> 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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