[ndnSIM] Modifying Interest and Data packets

[Spyridon (Spyros) Mastorakis]

Hi,

I do not see how you could achieve that by modifying the packet format…

I would suggest you modify NFD directly or write your own application that will be running on each node and implement the required logic.

Thanks,

Spyridon (Spyros) Mastorakis
Personal Website: http://cs.ucla.edu/~mastorakis/ <http://cs.ucla.edu/~mastorakis/>
Internet Research Laboratory
Computer Science Department
UCLA

> On Mar 8, 2017, at 1:00 PM, John Scott <scott1091 at yahoo.com> wrote:
> 
> Hi Spyros,
> 
> The title of the email is misleading, sorry. What I want to accomplish is the following:
> 
> At t=0s, Consumer node sends out an Interest with the prefix /name/segment_1. The application itself adds to the Interest /timestamp_1/some_other_field_1
> At t=2s, the Consumer nodes sends out another Interest with the prefix /name/segment_2/timestamp_2/some_other_field_2
> And so on.
> 
> The Producer node then interprets the Interest name, parses, and reply with the Data packet /name/segment_1/timestamp_3/some_other_field_3.
> 
> So a node can decide to drop a packet if (currentTime - timestamp_n) > threshold, for instance.
> 
> Can this be accomplish by modifying the Interest/Data packet in the ndn-cxx library or by using Interest filters and selectors?
> 
> Thank you
> 
> 
> 
> 
> 
> 
> On Tuesday, March 7, 2017 6:53 PM, Spyridon (Spyros) Mastorakis <mastorakis at cs.ucla.edu> wrote:
> 
> 
> Hi,
> 
> take a look at the ndn-cxx library used by ndnSIM:
> 
> https://github.com/named-data-ndnSIM/ndn-cxx <https://github.com/named-data-ndnSIM/ndn-cxx>
> 
> Modify the data and interest classes to add the fields that you want:
> 
> https://github.com/named-data-ndnSIM/ndn-cxx/blob/ndn-cxx-0.3.4-ndnSIM/src/data.cpp <https://github.com/named-data-ndnSIM/ndn-cxx/blob/ndn-cxx-0.3.4-ndnSIM/src/data.cpp>
> https://github.com/named-data-ndnSIM/ndn-cxx/blob/ndn-cxx-0.3.4-ndnSIM/src/interest.cpp <https://github.com/named-data-ndnSIM/ndn-cxx/blob/ndn-cxx-0.3.4-ndnSIM/src/interest.cpp>
> 
> Make sure that you also modify the way that you encode and decode an NDN packet to/from its wire format (methods wireEncode and wireDecode).
> 
> Hope that this helps,
> 
> Spyridon (Spyros) Mastorakis
> Personal Website: http://cs.ucla.edu/~mastorakis/ <http://cs.ucla.edu/~mastorakis/>
> Internet Research Laboratory
> Computer Science Department
> UCLA
> 
>> On Mar 7, 2017, at 12:26 PM, John Scott <scott1091 at yahoo.com <mailto:scott1091 at yahoo.com>> wrote:
>> 
>> Hi,
>> 
>> I would like to add extra information in the Interest and Data packets so that intermediate nodes can make forwarding decisions; however, I did not find this option in the ndnSIM.
>> Could you please point me to some references?
>> 
>> Thank you
>> 
> 
> 
> 

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