[Ndn-interest] Testbed architecture

[Lan Wang (lanwang)]

The NDN testbed currently uses udp tunnels between the hub nodes, but it is not restricted to using udp tunnels.  Other types tunnels can be used if there is a strong case for them.  Right now the tunnels are automatically set up by NLSR when it starts up, but we are moving this part out of NLSR.  Operators should then put the tunnel setup in NFD startup scripts and they can choose whichever type of tunnel that fits the purpose.

Lan

On Oct 21, 2016, at 7:50 AM, Muhammad Hosain Abdollahi Sabet <mhasabet at gmail.com<mailto:mhasabet at gmail.com>> wrote:

Hi Matteo,

As far as I know all of underlying connections are established on udp tunnels. You are registering a prefix on a faceUri, which is on a udp tunnel. But nfd cares about prefixes(names) and faces, and what the underlying of the face is, is out of scope of nfd.

Thanks,
Sabet

On Fri, Oct 21, 2016 at 3:59 PM, Matteo Bertolino <Matteo.Bertolino at eurecom.fr<mailto:Matteo.Bertolino at eurecom.fr>> wrote:
Dear Christos,
thank you for your answer. Yes I expressed bad myself, however the point of my question was your sentece:

"In many cases the face will use an IP tunnel to get to the next hop."

I would like to deepen this point actually. Precisely, how? Is it a TCP tunnel, an UDP tunnel, do you know where I can check how this tunnel is created?

Thank you very much.
Yours,
Matteo



Quoting Christos Papadopoulos <christos at colostate.edu<mailto:christos at colostate.edu>>:

Matteo,

Are you connected to the NDN testbed through a node local to you? If
yes, you would send an interest to your local NDN node, and that node
will in turn route your interest to the closest node that advertises
the content you are looking for.

Remember that with NDN you no longer communicate with other nodes
(unless they are named explicitly), you request content. Your Interest
will be directed to the closest provider of the content, which may be
your local node, if the content was cached there.

Now assuming that you requested content that is currently only
available through a publisher in the US, then your local node will
select a face to forward the Interest based on what NLSR (the NDN
routing protocol) specifies. In many cases the face will use an IP
tunnel to get to the next hop. Eventually your Interest will reach the
US publisher through a series of hops determined by the routing
protocol.

Not sure if this helps you, but I wanted to point out that in NDN the
term "I want to communicate with a node in the US" is not meaningful.

Christos.



On 10/21/2016 05:21 AM, Matteo Bertolino wrote:
Good morning community,
I am wondering whether a little literature about the Testbed  architecture is available.

I search something that probably is not included in the category  "Testbed" on the official site.

I mean, suppose that I am in Italy and I would like to communicate  with a node in US. I send an Interest, then I suppose that the  request is encapsulated in an IP request in order to arrive to  destination.
Is it correct? Can I know more about the practical steps?

Bests, Matteo

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