SOURCEFORGE » RALF » 2015 Improving TCP over satellite QoE

2. Simulation program¶

2.1. Simulation¶

Insertion des lignes de commandes SANS MODEM

1. Remote Terminal: ssh connexion
   ssh labo@192.168.0.200
2. 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

2.2. Post processing¶

Use of iperf and tcpdump as hereafter

Then we collect three parameters in order to analyse the network :
- the latency;
- the jitter;
- the loss of packets.

1. Save data, from management computer (192.168.0.102)
   scp labo@192.168.0.201:Proj3/*.

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.