1. Wireshark(Ethereal)

2. Wireshark(Ethereal) Step 1.
Wireshark is previously known as Ethereal. It switched name in May 2006 due to trademark issues .
Step 1.
Download and install wireshark from website(sourceforge)
Choose “Stable Release 1.4.4”

3. STEP BY STEP
Step 2.
Start Wireshark, select menu Capture->Options

4. STEP BY STEP Step 3. Choose your network interface.
TA’s Interface Choose your own here

5. STEP BY STEP
Step 4.
Seletct Capture Filter (more on this later)

6. STEP BY STEP Step 5. Click start, and use your computer as usual
After some network use
Before start capturing

7. STEP BY STEP
Step 6.
After 5 minutes, click “stop the running live capture”
Now you’ll have A LOT OF packets, with their time, source and dest. IP, protocol (may be in app., transport, or link layer), etc.

8. STEP BY STEP Step 7. You can type filter string into the ”Filter:” box
E.g. “http” can filter out all packets which are not HTTP packet
You can right click on a TCP packet, and use “Follow TCP Stream” to trace this TCP stream
“Follow TCP stream” shows packets in sequence and the way that the application layer sees it.
事實上，下面的動作也是加一個filter 8

9. STEP BY STEP
Step 8.
Now you can see detailed information of this TCP stream
The stream content is displayed in the same sequence as it appeared on the network.
Traffic from A to B is marked in red, while traffic from B to A is marked in blue.

10. Requirements & Grade
1.(10%) Download and install the Wireshark software:
Go to and download and install the Wireshark binary for your computer.

11. Requirements & Grade
2.(10%) How long did it take from when the HTTP GET message was sent until the HTTP OK reply was received

12. Requirements & Grade
3.(10%)How many HTTP GET request messages were sent by your browser? To which Internet addresses were these GET requests sent?
4.(10%)Can you tell whether your browser downloaded the two images serially, or whether they were downloaded from the two web sites in parallel? Explain. 

13. Requirements & Grade
5.(10%)How many packets were sent from your local machine and how many from the remote machine?

14. Requirements & Grade Deadline 4/6 23:59
mail to :
Do not copy others!
遲交一天扣5分

15. Requirements & Grade PART1 手寫作業 Ch1 problems: 2, 5, 6, 10, 23(a)(b)
Deadline 3/30 (助教上課前會去收)
Do not copy others!
遲交一天扣5分