@inproceedings{ding2019estimating,
  title={Estimating Logarithmic and Exponential Functions to Track Network Traffic Entropy in P4},
  author={Ding, Damu and Savi, Marco and Siracusa, Domenico},
  booktitle={IEEE/IFIP Network Operations and Management Symposium (NOMS)},
  year={2020}
}

1. Install docker if you don't already have it.

2. Clone the repository to local

   git clone https://github.com/DINGDAMU/P4Entropy.git    
   

3.  cd P4Entropy
   

4. If you want, put the p4app script somewhere in your path. For example:

   cp p4app /usr/local/bin
   

   I have already modified the default docker image to dingdamu/p4app-ddos:nwhhd, so p4app script can be used directly.

1. ./p4app run p4entropy.p4app 
   

   After this step you'll see the terminal of mininet
2. Forwarding at least 10 packets in mininet

Check the difference of entropy between

 pingall
 pingall

and

 h1 ping h2 -c 12 -i 0.1

3. Enter p4entropy.p4app folder

    cd p4entropy.p4app 
   

4. Check the result by reading the register

    ./read_registers1.sh
    ./read_registers2.sh
    ./read_registers3.sh
   

Register1-4 is Count Sketch

Register queryResult[0:3] is the queried packet count of last incoming flow in Count Sketch, and queryResult[4] is the median value of queryResult[0:3]

Register SUM is the result of Sum

Register S is total number of packets

In register finalResults, finalResults[0] is $log_2{Sum}$, finalResults[1] is $log_2{S}$, finalResults[2] is $2^{log_2{Sum}-log_2{S}}$ and finalResults[3] is the Entropy estimation. All results in this register are amplified $2^{10}$ times