[Ndn-interest] Interest Fields

Matteo Bertolino Matteo.Bertolino at eurecom.fr
Tue Dec 20 01:20:22 PST 2016

Dears Junxiao and Alex, thank you you the answers and the link, I  
understand all now!
Just to precise, the paper I'm referring is this one:  
(page 2, just before section III)

bests and happy xmas,

Quoting Alex Afanasyev <aa at cs.ucla.edu>:

> Hi Matteo,
> Just to add to what Junxiao said.  The paper you're looking   
> described the packet format at the time the paper was written. The   
> format is updated from time to time to reflect the latest   
> understanding: there were a few changes since the paper and we are   
> planning to make a few more soon.  The current format is described   
> in the NDN packet specification: http://named-data.net/doc/ndn-tlv/
> ---
> Alex
>> On Dec 19, 2016, at 8:50 AM, shijunxiao at email.arizona.edu wrote:
>> Hi Matteo
>> PublisherPublicKeyDigest has been replaced by   
>> PublisherPublicKeyLocator. The benefit is that routers do not need   
>> to compute the digest; the drawback is that the field is longer.
>> AnswerOriginKind belongs to CCNx 0.7.2 but never made to NDN packet  
>>  format. Its primary purpose is to restrict only producer or only   
>> cache can answer an Interest, but we believe it can be used for DoS  
>>  attacks. Its secondary purpose is to delete a Data packet from   
>> local ccnd CS; we plan to implement a management command for this,   
>> but there has never been a reasonable use case.
>> Yes, you can implement a CS policy to cache only certain prefixes.   
>> In afterInsert trigger of this policy, it should immediately evict   
>> any entries you do not want to cache by emitting beforeEvict signal.
>> Yours, Junxiao
>> From: Matteo Bertolino
>> Sent: Monday, December 19, 2016 09:34
>> To: ndn-interest at lists.cs.ucla.edu
>> Subject: [Ndn-interest] Interest Fields
>> Good morning guys,
>> I have some questions about interest fields and the content store.
>> Specifically:
>> 1- In a paper I've seen that an Interest could take the following
>> optional fields:
>> a) PublisherPublicKeyDigest (I just see PublisherPublicKeyLocator)
>> b) AnswerOriginKind.
>> But, grepping on ndn-cxx repo, I did not see that names. Does ndn-cxx
>> provide the following fields?
>> 2- Is it possible just caching some prefixes in the content store?
>> Thanks to everyone!
>> matteo

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