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MOURA, Ninon, 03/23/2016 12:33 AM


2. Simulation program

2.1. Simulation

Insertion des lignes de commandes SANS MODEM sur PEP right:

#!/bin/bash
~
Remote Terminal: ssh connexion
ssh
Super User Connexion
sudo su
~
  1. Definition of p5p1 IP adress
    ifconfig p5p1 192.168.2.2
  2. Definition of p6p1 IP adress
    ifconfig p5p1 192.168.3.1
  1. Add space delay to user interface
    tc qdisc add dev p5p1 root netem delay 600ms
  1. Test connection and delay
  2. from 192.168.2.1 to 192.168.3.1
    ping 192.168.3.1 -I 192.168.2.1
  1. Re-routing rule to in order to use PEPSal
    iptables -t mangle -A PREROUTING -s 192.168.2.1 --proto tcp --tcp-flags ALL SYN -j QUEUE
    iptables -t nat -A PREROUTING -s 192.168.2.1 --proto tcp -j REDIRECT --to-port 5000
    iptables -t mangle -A PREROUTING -d 192.168.3.1 --proto tcp --tcp-flags ALL SYN -j QUEUE
    iptables -t nat -A PREROUTING -d 192.168.3.1 --proto tcp -j REDIRECT --to-port 5000
  1. Display all rules
    iptables -t mangle -t nat -L
  1. Proxy PEPSal
  2. pepsal -a 192.168.2.1

Then a TCP flow is simulated thanks to the iperf command.

2.2. Post processing

In order to get information on TCP packets, the tcpdump commmand is executed. The save option is run and data are collected in a file.pcap.
Command is:
tcpdump tcp -w fileName.pcap

  1. Files transfert from PC engine right to local computer
    scp :Proj3/*.
The file generated by tcpdump command is compatibile with wireshark. Wireshark is a free network protocol analyzer. It lets you see what's happening on your network at a microscopic level. Thanks to this tool, we could compare with and without PEPSal:
  • throughput,
  • sequence number packets,
  • windows size evolution.

Tests in terms of quality of usage, such as download a web browser, were planed. However due to difficulties in network configuration, those tests will not be run.