[Mini-NDN] [Nfd-dev] Why the tags are 64 bit? What is packet overhead?

[Aman Maldar]

Yes, I got it. Thank you. I have the tags working. I was trying to figure
out how the tags add to the traffic.

On Sun, Nov 18, 2018 at 3:42 AM Alex Afanasyev <cawka1 at gmail.com> wrote:

> Hi Aman,
>
> The tags are just in-memory annotation of the packet and have no direct
> impact on the size of the actual packet.  To encode any value of the tag,
> you will need to provision it as part of, for example, NDNLP encoding
> process.   Therefore, if you just added a custom tag on the packet and
> didn't change any encoding, you will not see any changes in packet size,
> nor see anything when dissecting the packet.
>
> The code has a few examples for tag encoding, look in face.cpp and
> detail/face-impl.hpp.
>
> --
> Alex
>
> On Nov 17, 2018, at 7:26 PM, Aman Maldar <amanmaldar at gmail.com> wrote:
>
> Hello All,
>  I have 2 questions.
> First,
> I have added hopCount tag to the packet. But my questions is why these
> tags have to be 64 bit log? I tried to use 16/32 bit long tags. I got
> compilation issues.
> I see the following tags are also defined as 64 bit long. ref -
> https://github.com/named-data/ndn-cxx/blob/master/src/lp/tags.hpp
>
> typedef SimpleTag<uint64_t, 10> IncomingFaceIdTag;
> typedef SimpleTag<uint64_t, 11> NextHopFaceIdTag;
>
> Second,
> Also, is there a way I can calculate the interest packet overhead after
> adding a new tag?
> If I do following before and after adding the tags, would I get correct
> result?
> auto intSize = interest.wireEncode().size();
>
> Ndn-dissect didn't work very well, I didn't get what I was looking for.
> Some fields were missing.
>
> --
> *Regards,*
> *Mr. Maldar Aman M.*
> *University of Massachusetts, Lowell*
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>
>
>

-- 
*Regards,*
*Mr. Maldar Aman M.*
*University of Massachusetts, Lowell*
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