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

Ru Jia rujia721 at gmail.com
Sun May 7 09:26:31 PDT 2017

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

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

Ru Jia

On Sun, May 7, 2017 at 3:39 AM, Junxiao Shi <shijunxiao at email.arizona.edu>

> 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/
> Yours, Junxiao
> On May 6, 2017 12:06, "Ru Jia" <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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