[ndnSIM] How to add a new TLV filed to the Data packet

[Spyridon (Spyros) Mastorakis]

Hi,

Junxiao pointed you to a link with specific steps on how to add a custom TLV to NDN packets in ndnSIM.

Please read through the steps described there and follow them.

Thanks,

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

> On May 7, 2017, at 9:26 AM, Ru Jia <rujia721 at gmail.com> wrote:
> 
> Dear Junxiao,
>  
> I am sorry I didn't make myself more clear, I dipected it more specific last time and I thought it would be the same gay reply to me. The thing is I want to determine whether the routers should cache the data based on the number of times the data was requested, so I only need to count the number of the first several times when data packet is still fetched from the provider. 
> 
> Last time, Spyridon Mastorakis replied my email and told me I could add a new TLV field to the Data packet and increment it every time that this data packet is requested. But i am still a little confused about how to realize that.
> 
> Ru Jia
> 
> On Sun, May 7, 2017 at 3:39 AM, Junxiao Shi <shijunxiao at email.arizona.edu <mailto:shijunxiao at email.arizona.edu>> wrote:
> Hi Ru
> 
> Before talking about code, we need to understand the protocol.
> NDN network is a distributed system, c and forwarding is hop-by-hop. Every NDN node has a ContentStore which is an opportunistic cache of Data packets.
> A Data is "requested" if a consumer expresses an Interest that can be satisfied by the Data. The Data can be served from a producer, or from a cache anywhere in the network.
> While a node can count how many times a Data is "requested" by an Interest reaching this node, it would not be possible to count how many times a Data is requested globally without using additional control messages.
> 
> Regarding code: see https://lo.calho.st/networks/adding-custom-packet-fields-to-packets-in-ndnsim-2-3-without-forking-the-entire-repository/ <https://lo.calho.st/networks/adding-custom-packet-fields-to-packets-in-ndnsim-2-3-without-forking-the-entire-repository/>
> 
> Yours, Junxiao
> 
> 
> On May 6, 2017 12:06, "Ru Jia" <rujia721 at gmail.com <mailto:rujia721 at gmail.com>> wrote:
> Hello，
> 
> If I want to record the number of times the data was requested, how to add a new TLV filed to the Data packet? Is there any material or codes that I can refer to? 
> 
> Thanks advanced for your response.
> Ru Jia
> 

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