Wireshark & Iperf
NA 有線組 林子傑
Intro
What is “Wireshark”?
A software tool that sniffs the network traffic transmitted from your own PC.
What is “iperf”?
A software tool that examines the network bandwidth between 2 hosts.
Get a VM!
Why experiment in VM?
Wireshark needs to privileged mode to do traffic sniffing.
Install any package you want!
Backup & Recovery
How?
Import the VM image provided by TAs.
Install by yourself.
Import a VM image
Start the VM
OS: Trisquel Linux
Browser: Midori
Terminal: LXTerminal
Our VM Enviroment:
OS: Trisquel Linux (A branch from Ubuntu, light-weight OS)
Account/Password: student/student
Default Browser: Midori (Not Firefox or Chrome!)
Shortcut for Terminal: Ctrl+Alt+T
Install “Wireshark”:
sudo apt-get install wireshark
Install “iperf”:
sudo apt-get install iperf
Wireshark
Choose a network interface before you start sniffing Start sniffing
Wireshark
All transmitted packets during sniffing
Layer Information of a selected packet
Binary & ASCII form of a selected packet
Iperf
It’s a cmd-line utility, Not GUI
Server-side command:
iperf -s
Client-side command:
iperf –c <Server’s IP>
Exercise 1
Start sniffing the network traffic with Wireshark
Try to login to 104 Job Bank with any string for Account/Password, e.g. your Student ID
Stop sniffing and find the transmitted packet.
Find the Account/Password string you typed previously.
Exercise 2
Find a partner, and test the bandwidth between your VMs using “iperf”.
In our VM environment, is server-side IP accessible from the client-side?
Hint 1: Adjust your VM’s network interface to “Bridged” not “NAT”!!
Hint 2: Google it or Ask TAs!!
