[ndnSIM] NACKs in ndnSIM2.0?

Christian Kreuzberger christian.kreuzberger at itec.aau.at
Sun Feb 8 10:47:53 PST 2015


I have a follow-up question about NACKs in NFD/ndnSIM:
are there ongoing discussions or RFCs about how NACKs should be used 
interpreted? http://named-data.net/doc/ndn-tlv/data.html states that 
NACK has
been removed on purpose, but: "NACK is used to signal a downstream node 
the upstream node is unable to retrieve a matching data. Since the 
actual NACK
mechanism is still under active investigation, we do not include it in 
version of specification, but may add it back in a future version".

Best regards,

On 2015-02-06 18:09, Spyridon (Spyros) Mastorakis wrote:
> Hello,
> in ndnSIM 2.0, we use the NDN Forwarding Daemon (NFD). NFD does not
> currently support NACKs as data packets. However, it is a feature
> planned to be added in the future.
> As soon as this feature is added in NFD, it is going to be supported
> by ndnSIM as well.
> --
> Spyridon (Spyros) Mastorakis
> Personal Website: http://cs.ucla.edu/~mastorakis/
> Internet Research Laboratory
> PhD Computer Science
>> On Feb 6, 2015, at 1:07 AM, Daniel Posch <poschdaniel2 at gmail.com> 
>> wrote:
>> Hello,
>> I am trying to port a forwarding strategy, which I have implemented in 
>> ndnSIM1.0 to ndnSIM2.0. I have looked through the documents and API 
>> specification, however, I don't understand if and how the concept of 
>> "NACKs" is supported in ndnSIM2.0. Can someone give me a hint how to 
>> implement the following in ndnSIM2.0:
>> Assume a forwarding strategy decides to proactively discard an 
>> Interest message. What would be the best way to propagate this 
>> information to the requesting neighboring? In ndnSIM1.0 I have used 
>> the build-in NACK-response from the NACK-Strategy, which responds with 
>> a NACK-message once all faces have been set to "waiting in vain".
>> Best regards,
>> Daniel
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